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Introduction and exercises to the general SARL syntax

Note If you don’t know how to solve an problem, or what is the function to be used, you could search on Internet for the answer using the API of the Java programming language. Indeed, since SARL is fully compatible with the Java API, you could use all the types or functions that are defined in this Java API.

1. Exercise 1

Write a SARL program to print the following string in a specific format (see the output).
Expected output:


Twinkle, twinkle, little star,
	How I wonder what you are! 
		Up above the world so high,   		
		Like a diamond in the sky. 
Twinkle, twinkle, little star, 
	How I wonder what you are


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		println("Twinkle, twinkle, little star,ntHow I wonder what you are!nttUp above the world so high,nttLike a diamond in the sky.ntTwinkle, twinkle, little star,ntHow I wonder what you are")
	}
}

2. Exercise 2

Write a SARL program to display the current date and time.
Expected output :

Current date and time:
2014-07-05 14:34:14


import io.sarl.api.core.Initialize
import java.util.Date
agent Solution {
	on Initialize {
		var dt = new Date
		println(dt)
	}
}

3. Exercise 3

Write a SARL program that calculates the area of a circle based on the radius entered by the user from the command line when your are launching the agent.
Expected output:

r = 1.1;
Area = 3.8013271108436504


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var r = occurrence.parameters.get(0) as Double
		var area = Math::PI * r**2
		println("r = " + r)
		println("; Area = " + area)
	}
}

4. Exercise 4

Write a SARL program that accepts the user’s first and last name as inputs from the command line, and prints them in reverse order with a space between them.


import io.sarl.api.core.Initialize
agent A {
	on Initialize {
		var firstname = occurrence.parameters.get(0) as String
		var lastname = occurrence.parameters.get(1) as String
		println(lastname + " " + firstname)
	}
}

5. Exercise 5

Write a SARL program that accepts a sequence of comma-separated numbers from the command line and generates a list of those numbers.
Example of input string: 3, 5, 7, 23
Expected output:

List : ['3', ' 5', ' 7', ' 23']


import io.sarl.api.core.Initialize
agent A {
	on Initialize {
		var numberListString = occurrence.parameters.get(0) as String
		var numberArray = numberListString.split("\s*,\s*")
		var numberList = newArrayList(numberArray)
		println("List : " + numberList)
	}
}

6. Exercise 6

Write a SARL program that accepts a filename from the command line, and prints the extension of the file.
Input filename: abc.sarl
Expected output: sarl


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var filename = occurrence.parameters.get(0) as String
		var idx = filename.indexOf('.')
		if (idx >= 0) {
			println(filename.substring(idx + 1))
		}
	}
}

7. Exercise 7

Write a SARL program to display the first and last colors from the following list.
Example of inut list: color_list = ["Red","Green","White" ,"Black"]


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var color_list = #["Red", "Green", "White", "Black"]
		println(color_list.get(0))
		println(color_list.get(color_list.length - 1))
	}
}

8. Exercise 8

Write a SARL program that accepts an integer n on the command line and computes the value of n+nn+nn*n.
For example, input value for n is 5
Expected result : 615


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var n = occurrence.parameters.get(0) as Integer
		var value = n + n**2 + n**3
		println("Result : " + value)
	}
}

9. Exercise 9

Write a SARL program that prints the calendar for a given month and year.

Note: Use ‘GregorianCalendar’ type from the Java API.


import io.sarl.api.core.Initialize
import java.util.GregorianCalendar
agent Solution {
	on Initialize {
		var month = occurrence.parameters.get(0) as Integer
		var year = occurrence.parameters.get(1) as Integer
		var cal = new GregorianCalendar(year, month, 1)
		println(cal)
	}
}

10. Exercise 10

Write a SARL program to calculate the number of days between two dates.
Examples of input dates: (2014, 7, 2), (2014, 7, 11)
Expected output : 9 days


import io.sarl.api.core.Initialize
import java.time.LocalDate
import java.time.temporal.ChronoUnit
agent Solution {
	on Initialize {
		var day0 = occurrence.parameters.get(0) as Integer
		var month0 = occurrence.parameters.get(1) as Integer
		var year0 = occurrence.parameters.get(2) as Integer
		
		var day1 = occurrence.parameters.get(3) as Integer
		var month1 = occurrence.parameters.get(4) as Integer
		var year1 = occurrence.parameters.get(5) as Integer
		
		var cal0 = LocalDate::of(year0, month0, day0)
		var cal1 = LocalDate::of(year1, month1, day1)
		
		var days = ChronoUnit::DAYS.between(cal1, cal0)
		println(days + " days")
	}
}

11. Exercise 11

Write a SARL program to get the volume of a sphere with radius six.


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var volume = 4/3 * Math::PI * 6**3;
		println(volume)
	}
}

12. Exercise 12

Write a SARL program to calculate the difference between a given number and 17. If the number is greater than 17, return twice the absolute difference.


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var number = occurrence.parameters.get(0) as Integer
		var diff = number - 17
		if (diff < 0) {
			diff = 2 * -diff
		}
		println(diff)
	}
}

13. Exercise 13

Write a SARL program to test whether a number is within a distance 100 to 1000 or 2000.

14. Exercise 14

Write a SARL program to calculate the sum of three given numbers, that are provided on the command line. If the values are equal, return three times their sum.


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var number0 = occurrence.parameters.get(0) as Integer
		var number1 = occurrence.parameters.get(1) as Integer
		var number2 = occurrence.parameters.get(2) as Integer
		
		var sum = number0 + number1 + number2
		if (number0 == number1 && number1 == number2) {
			sum *= 3
		}
		println(sum)
	}
}

15. Exercise 15

Write a SARL program to get a newly-generated string from a given string where Is has been added to the front. Return the string unchanged if the given string already begins with Is.

16. Exercise 16

Write a SARL program that returns a string that is n (non-negative integer) copies of a given string (from the command line).


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var str = occurrence.parameters.get(0) as String
		var n = occurrence.parameters.get(1) as Integer
		var result = ""
		for (i : 1..n) {
			result += str
		}
		println(result)
	}
}

17. Exercise 17

Write a SARL program that determines whether a given number (accepted from the command line) is even or odd, and prints an appropriate message to the user.


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var n = occurrence.parameters.get(0) as Integer
		if ((n%2) == 0) {
			println("Even number: " + n)
		} else {
			println("Odd number: " + n)
		}
	}
}

18. Exercise 18

Write a SARL program to count the number 4 in a given list, provided on the command line.


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var n = 0
		for (arg : occurrence.parameters) {
			try {
				var nb = arg as Integer
				if (nb == 4) {
					n++
				}
			} catch (ex : Throwable) {
			}
		}
		println(n)
	}
}

19. Exercise 19

Write a SARL program to get n (non-negative integer) copies of the first 2 characters of a given string (from the command line). Return n copies of the whole string if the length is less than 2.


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var input = occurrence.parameters.get(0) as String
		var n = occurrence.parameters.get(1) as Integer
		var token : String
		if (input.length < 2) {
		    token = input
		} else {
		    token = input.substring(0, 2)
		}
		var result = ""
		for (i : 1..n) {
		    result += input
		}
		println(result)
	}
}

20. Exercise 20

Write a SARL program to test whether a passed letter from the command line is a vowel or not.


import io.sarl.api.core.Initialize
agent Solution {
	val vowels = newArrayList('a', 'e', 'i', 'o', 'u', 'y')
	
	on Initialize {
		var str = occurrence.parameters.get(0) as String
		var letter = (str.charAt(0) as Character).toLowerCase
		if (vowels.contains(letter)) {
			println("The letter is a vowel")
		} else {
			println("The letter is not a vowel")
		}
	}
}

21. Exercise 21

Write a SARL program that checks whether a specified value is contained within a group of values.
Examples:

3 -> [1, 5, 8, 3] : True
-1 -> [1, 5, 8, 3] : False


import io.sarl.api.core.Initialize
agent Solution {
	val group = newArrayList(1, 5, 8, 3)
	
	on Initialize {
		var value = occurrence.parameters.get(0) as Integer
		println(value + " -> " + group + " : " + group.contains(value))
	}
}

22. Exercise 22

Write a SARL program that concatenates all elements in a list into a string and returns it.


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var list = newArrayList
		for (arg : occurrence.parameters) {
			var str = arg as String
			list += str
		}
		println(list)
	}
}
</code></pre>

</div>

## 23. Exercise 23

* Write a SARL program to print all even numbers from a given list of numbers in the same order and stop printing any after 237 in the sequence.
* Sample numbers list:

```text
numbers = [    
    386, 462, 47, 418, 907, 344, 236, 375, 823, 566, 597, 978, 328, 615, 953, 345, 
    399, 162, 758, 219, 918, 237, 412, 566, 826, 248, 866, 950, 626, 949, 687, 217, 
    815, 67, 104, 58, 512, 24, 892, 894, 767, 553, 81, 379, 843, 831, 445, 742, 717, 
    958,743, 527
    ]
```

Answer


import io.sarl.api.core.Initialize
agent Solution {
	var numbers : int[] = #[    
	    386, 462, 47, 418, 907, 344, 236, 375, 823, 566, 597, 978, 328, 615, 953, 345, 
	    399, 162, 758, 219, 918, 237, 412, 566, 826, 248, 866, 950, 626, 949, 687, 217, 
	    815, 67, 104, 58, 512, 24, 892, 894, 767, 553, 81, 379, 843, 831, 445, 742, 717, 
	    958,743, 527
	]
	on Initialize {
		var i = 0
		while (i < numbers.length && i < 237) {
			println(numbers.get(i))
			i++
		}
	}
}




## 24. Exercise 24

* Write a SARL program that prints out all colors from `color_list_1` that are not present in `color_list_2`.
* Test data:

```text
color_list_1 = set(["White", "Black", "Red"])
color_list_2 = set(["Red", "Green"])
```

* Expected output:

```text
{'Black', 'White'}
```

Answer


import io.sarl.api.core.Initialize
agent Solution {
	var color_list_1 = newHashSet(#["White", "Black", "Red"])
	var color_list_2 = newHashSet(#["Red", "Green"])
	on Initialize {
		for (col : color_list_1) {
			if (!color_list_2.contains(col)) {
				println(col)
			}
		}
	}
}




## 25. Exercise 25

* Write a SARL program that will accept the base and height of a triangle and compute its area.

Answer


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var base = occurrence.parameters.get(0) as Double
		var height = occurrence.parameters.get(1) as Double
		var area = (base * height) / 2
		println("Area = " + area)
	}
}




## 26. Exercise 26

* Write a SARL program that computes the greatest common divisor (GCD) of two positive integers.

Answer


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var number1 = occurrence.parameters.get(0) as Double
		var number2 = occurrence.parameters.get(1) as Double
		var gcd = gcd(number1, number2)
		println("GCD(" + number1 + ", "+ number2 + ") = " + gcd)
	}
	def gcd(a : double, b : double) : double {
		var da = a
		var db = b
		while (da != db) {
			if (da > db) {
				da = da - db
			} else {
				db = db - da
			}
		}
		return da
	}
}




## 27. Exercise 27

* Write a SARL program to find the least common multiple (LCM) of two positive integers.

Answer


import io.sarl.api.core.Initialize
import static java.lang.Math.*
agent Solution {
	on Initialize {
		var number1 = occurrence.parameters.get(0) as Double
		var number2 = occurrence.parameters.get(1) as Double
		var lcm = lcm(number1, number2)
		println("LCM(" + number1 + ", "+ number2 + ") = " + lcm)
	}
	def lcm(a : double, b : double) : double {
		abs(a * b) / gcd(a, b)
	}
	def gcd(a : double, b : double) : double {
		var da = a
		var db = b
		while (da != db) {
			if (da > db) {
				da = da - db
			} else {
				db = db - da
			}
		}
		return da
	}
}




## 28. Exercise 28

* Write a SARL program to sum three given integers. However, if two values are equal, the sum will be zero.

Answer


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var number1 = occurrence.parameters.get(0) as Integer
		var number2 = occurrence.parameters.get(1) as Integer
		var number3 = occurrence.parameters.get(2) as Integer
		var sum = 0
		if (number1 != number2 && number2 != number3 && number1 != number3) {
			sum = number1 + number2 + number3
		}
		println(sum);
	}
}




## 29. Exercise 29

* Write a SARL program to sum two given integers. However, if the sum is between 15 and 20 it will return 20.

Answer


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var number1 = occurrence.parameters.get(0) as Integer
		var number2 = occurrence.parameters.get(1) as Integer
		var sum = number1 + number2
		if ((15..20).contains(sum)) {
			sum = 20
		}
		println(sum);
	}
}




## 30. Exercise 30

* Write a SARL program that returns `true` if the two given integer values are equal or their sum or difference is 5.

Answer


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var number1 = occurrence.parameters.get(0) as Integer
		var number2 = occurrence.parameters.get(1) as Integer
		var result = program(number1, number2)
		println(result);
	}
	def program(number1 : int, number2 : int) : boolean {
		number1 == number2 || number1 + number2 == 5
	}
}




## 31. Exercise 31

* Write a SARL program to add two objects if both objects are integers.

Answer


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var number1 = occurrence.parameters.get(0)
		var number2 = occurrence.parameters.get(1)
		var result = sum(number1, number2)
		println(result);
	}
	def sum(number1 : Object, number2 : Object) : int {
		if (number1 instanceof Number) {
			if (number2 instanceof Number) {
				return number1.intValue + number2.intValue
			}
		}
		return 0
	}
}




## 32. Exercise 32

* Write a SARL program to solve `(x + y) * (x + y)`.
* Test Data: `x = 4, y = 3`
* Expected Output: `(4 + 3) ^ 2 = 49`

Answer


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var x = occurrence.parameters.get(0) as Double
		var y = occurrence.parameters.get(1) as Double
		var result = solve(x, y)
		println(result);
	}
	def solve(x : double, y : double) : double {
		(x + y) ** 2
	}
}




## 33. Exercise 33

* Write a SARL program to calculate the distance between the points (x1, y1) and (x2, y2).

Answer


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var x1 = occurrence.parameters.get(0) as Double
		var y1 = occurrence.parameters.get(1) as Double
		var x2 = occurrence.parameters.get(2) as Double
		var y2 = occurrence.parameters.get(3) as Double
		var result = distance(x1, y1, x2, y2)
		println(result);
	}
	def distance(x1 : double, y1 : double, x2 : double, y2 : double) : double {
		Math::sqrt((x2 - x1)**2 + (y2 - y1)**2)
	}
}




## 34. Exercise 34

* Write a SARL program to check whether a file exists, when the name of the file is provided from the command line. Use the Java API.

Answer


import io.sarl.api.core.Initialize
import java.io.File
agent Solution {
	on Initialize {
		var filename = occurrence.parameters.get(0) as String
		var file = new File(filename)
		var isExist = file.exists
		println(isExist);
	}
}




## 35. Exercise 35

* Write a SARL program to parse a string to float or integer.

Answer


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var value = occurrence.parameters.get(0) as String
		try {
			var floatNumber = value as Double
			println("Double value = " + floatNumber)
		} catch (ex : Throwable) {
			var intNumber = value as Long
			println("Long value = " + intNumber)
		}
	}
}




## 36. Exercise 36

* Write a SARL program to list all files in a directory.

Answer


import io.sarl.api.core.Initialize
import java.io.File
agent Solution {
	on Initialize {
		var folderName = occurrence.parameters.get(0) as String
		var folder = new File(folderName)
		var list = folder.listFiles
		println(list)
	}
}




## 37. Exercise 37

* Write a SARL program to print a message provided from the command line without a newline or space.

Answer


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var value = occurrence.parameters.get(0) as String
		value = value.replaceAll("[n ]+", "")
		println(value)
	}
}




## 38. Exercise 38

* Write a SARL program to print to STDERR (standard error output of the process).

Answer


import io.sarl.api.core.Initialize
import io.sarl.api.core.Logging
agent Solution {
	uses Logging
	on Initialize {
		var value = occurrence.parameters.get(0) as String
		error(value)
	}
}





## 39. Exercise 39

* Write a SARL program to access environment variables.

Answer


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var variableName = occurrence.parameters.get(0) as String
		println(System::getProperty(variableName))
	}
}




## 40. Exercise 40

* Write a SARL program to get the current username.

Answer


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		println(System::getProperty("user.name"))
	}
}




## 41. Exercise 41

* Write a SARL program to sum the first n positive integers.

Answer


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var n = occurrence.parameters.get(0) as Integer
		var sum = 0
		for (i : 1..n) {
			sum += i
		}
		println(sum)
	}
}




## 42. Exercise 42

* Write a SARL program to convert height (in feet and inches) to centimeters, when the value is provided from the command line.

Answer


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var height = occurrence.parameters.get(0) as Double
		height = 2.54 * height
		println(height)
	}
}




## 43. Exercise 43

* Write a SARL program to calculate the hypotenuse of a right angled triangle.

Answer


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var side1 = occurrence.parameters.get(0) as Double
		var side2 = occurrence.parameters.get(1) as Double
		var hypotenuse = Math::sqrt(side1**2 + side2**2)
		println(hypotenuse)
	}
}




## 44. Exercise 44

* Write a SARL program to convert all units of time into seconds.

Answer


import io.sarl.api.core.Initialize
import static java.util.concurrent.TimeUnit.*
agent Solution {
	on Initialize {
		var days = occurrence.parameters.get(0) as Long
		var hours = occurrence.parameters.get(1) as Long
		var minutes = occurrence.parameters.get(1) as Long
		var seconds = occurrence.parameters.get(1) as Long
		var total = DAYS.toSeconds(days) + HOURS.toSeconds(hours) + MINUTES.toSeconds(hours) + seconds
		println(total)
	}
}




## 45. Exercise 45

* Write a SARL program to get an absolute file path from a name that is provided on the command line.

Answer


import io.sarl.api.core.Initialize
import java.io.File
agent Solution {
	on Initialize {
		var name = occurrence.parameters.get(0) as String
		var file = new File(name)
		var absoluteFilename = file.absolutePath
		println(absoluteFilename)
	}
}




## 46. Exercise 46

* Write a SARL program that converts seconds into days, hours, minutes, and seconds.

Answer


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var seconds = occurrence.parameters.get(0) as Integer
		var days = (seconds / (3600 * 24)) as int
		seconds = seconds - days * 3600 * 24
		var hours = (seconds / 3600) as int
		seconds = seconds - hours * 3600
		var minutes = (seconds / 60) as int
		seconds = seconds - minutes * 60
		println("Days = " + days)
		println("Hours = " + hours)
		println("Minutes = " + minutes)
		println("Seconds = " + seconds)
	}
}




## 47. Exercise 47

* Write a SARL program to calculate the body mass index.

Answer


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var weight = occurrence.parameters.get(0) as Double
		var height = occurrence.parameters.get(1) as Double
		var bmi = weight / height**2
		println(bmi)
	}
}




## 48. Exercise 48

* Write a SARL program to convert pressure in kilopascals to pounds per square inch, a millimeter of mercury (mmHg) and atmosphere pressure.

Answer


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var kilopascals = occurrence.parameters.get(0) as Double
		var psl = kilopascals * 0.145038
		println("Pounds per square inch = " + psl + " Psl")
		var mmhg = kilopascals * 7.50062
		println("Millimeters of mercury = " + mmhg + " mmHg")
		var atmosphere = kilopascals / 101.325
		println("Atmosphere pressure = " + atmosphere + " atmosphere")
	}
}




## 49. Exercise 49

* Write a SARL program to calculate sum of digits, from a string of characters, of a number.

Answer


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var value = occurrence.parameters.get(0) as String
		var sum = 0
		for (c : value.toCharArray) {
			if (c >= '0' && c <= '9') {
				sum += (c - '0') as int
			}
		}
		println(sum)
	}
}




## 50. Exercise 50

* Write a SARL program to sort three integers without using conditional statements and loops.

Answer


import io.sarl.api.core.Initialize
import static java.lang.Math.*
agent Solution {
	on Initialize {
		var x = occurrence.parameters.get(0) as Integer
		var y = occurrence.parameters.get(1) as Integer
		var z = occurrence.parameters.get(2) as Integer
		var a1 = min(x, min(y, z))
		var a3 = max(x, max(y, z))
		var a2 = (x + y + z) - a1 - a3
		println("Numbers in sorted order: (" + a1 + ", " + a2 + ", "  + a3 + ")")
	}
}




## 51. Exercise 51

* Write a SARL program to concatenate N strings.

Answer


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var all = ""
		for (p : occurrence.parameters) {
			all += p as String
		}
		println(all)
	}
}




## 52. Exercise 52

* Write a SARL program to calculate the sum of all items of a container (array, list, set).

Answer


import io.sarl.api.core.Initialize
import java.util.stream.Collectors
import static extension java.util.Arrays.*
agent Solution {
	on Initialize {
		var s = sum(occurrence.parameters.asList.stream
			.filter[it instanceof Number]
			.map[it as Number].collect(Collectors.toList))
		println(s)
	}
	def sum(container : Iterable<? extends Number>) : double {
		var s = 0.0
		var iter = container.iterator
		while (iter.hasNext) {
			var elt = iter.next
			s += elt as double
		}
		return s
	}
}




## 53. Exercise 53

* Write a SARL program to test whether all numbers in a list, provided on the command line, are greater than a certain number, provided also on command line.

Answer


import io.sarl.api.core.Initialize
import static extension java.util.Arrays.*
agent Solution {
	on Initialize {
		var input = occurrence.parameters.asList.stream
			.filter[it instanceof Number]
			.map[it as Number]
		var iter = input.iterator
		var reference = iter.next as double
		var output = newArrayList
		while (iter.hasNext) {
			var n = iter.next as double
			if (n > reference) {
				output += n
			}
		}
		println(output)
	}
}




## 54. Exercise 54

* Write a SARL program to count the number of occurrences of a specific character in a string.

Answer


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var c = occurrence.parameters.get(0) as Character
		var value = occurrence.parameters.get(1) as String
		var count = value.chars.filter[it == c].count
		println(count)
	}
}




## 55. Exercise 55

* Write a SARL program to check whether a file path, provided on the command line, is a file or a directory.

Answer


import io.sarl.api.core.Initialize
import java.io.File
agent Solution {
	on Initialize {
		var filename = occurrence.parameters.get(0) as String
		var file = new File(filename)
		println(file.isFile || file.isDirectory)
	}
}




## 56. Exercise 56

* Write a SARL program to swap two variables.

Answer


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var var1 = occurrence.parameters.get(0)
		var var2 = occurrence.parameters.get(1)
		var tmp = var1
		var1 = var2
		var2 = tmp
		println("var1 = " + var1)
		println("var2 = " + var2)
	}
}




## 57. Exercise 57

* Write a SARL program to check whether a string is numeric.

Answer


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var value = occurrence.parameters.get(0) as String
		println(isNumeric(value))
	}
	def isNumeric(value : String) : boolean {
		try {
			Double::parseDouble(value)
			return true
		} catch (ex : Throwable) {
			return false
		}
	}
}




## 58. Exercise 58

* Write a SARL program to prove that two string variables of the same value point to the same memory location.

Answer


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		var value1 = occurrence.parameters.get(0) as String
		var value2 = occurrence.parameters.get(2) as String
		println(isSameAddressInMemory(value1, value2))
	}
	def isSameAddressInMemory(value1 : String, value2 : String) : boolean {
		value1 === value2
	}
}




## 59. Exercise 59

* Write a SARL program to determine the largest and smallest integers, longs, and floats.

Answer


import io.sarl.api.core.Initialize
agent Solution {
	on Initialize {
		println("Min integer = " + Integer::MIN_VALUE)
		println("Max integer = " + Integer::MAX_VALUE)
		println("Min long = " + Long::MIN_VALUE)
		println("Max long = " + Long::MAX_VALUE)
		println("Min float = " + Float::MIN_VALUE)
		println("Max float = " + Float::MAX_VALUE)
	}
}




## 60. Version Specification

* Specification: SARL General-purpose Agent-Oriented Programming Language ("Specification")
* Version: 0.15
* Status: Stable Release
* Release: 2025-09-11

## 61. Legal Notice

> Copyright © 2014-2025 [SARL.io, the Original Authors and Main Authors](http://www.sarl.io/about/index.html).
>
> Documentation text and medias are licensed under the Creative Common CC-BY-SA-4.0;
> you may not use this file except in compliance with CC-BY-SA-4.0.
> You may obtain a copy of [CC-BY-4.0](https://creativecommons.org/licenses/by-sa/4.0/deed.en).
>
> Examples of SARL code are licensed under the Apache License, Version 2.0;
> you may not use this file except in compliance with the Apache License.
> You may obtain a copy of the [Apache License](http://www.apache.org/licenses/LICENSE-2.0).
>
> You are free to reproduce the content of this page on copyleft websites such as Wikipedia.

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