Scala Programming: Check whether a given positive number is a multiple of 3 or a multiple of 7

Scala Programming Basic Exercise-11 with Solution

Write a Scala program to check whether a given positive number is a multiple of 3 or a multiple of 7.

Sample Solution:

Scala Code:

// Define an object named scala_basic
object scala_basic {
  // Define a function named test with parameter n of type Int, returning a Boolean
  def test(n: Int): Boolean = 
    {
      // Check if n is divisible by 3 or 7 using the modulo operator
      n % 3 == 0 || n % 7 == 0;
    }
     
   // Define the main method, which is the entry point of the program
   def main(args: Array[String]): Unit = {
      // Print the result of calling test with the argument 3
      println("Result: " + test(3))
      
      // Print the result of calling test with the argument 14
      println("Result: " + test(14))
      
      // Print the result of calling test with the argument 12
      println("Result: " + test(12))
      
      // Print the result of calling test with the argument 37
      println("Result: " + test(37))
    }
}

Sample Output:

Result: true
Result: true
Result: true
Result: false

Explanation:

Here is the break down of the said Scala code:

• object scala_basic {: This declares an object named scala_basic.
• def test(n: Int): Boolean =: This line defines a function named test that takes a parameter n of type Int and returns a Boolean. The function checks if n is divisible by 3 or 7 using the modulo operator (%). If the remainder is zero for either of these divisions, the function returns true; otherwise, it returns false.
• n % 3 0 || n % 7 0;: This line is the implementation of the test function. It checks if the remainder of the division of n by 3 is zero (n % 3 0) or if the remainder of the division of n by 7 is zero (n % 7 0). The result of this expression is a Boolean indicating whether the condition is true or false. However, there is a semicolon at the end, which makes this line a statement that does not affect the return value of the function.
• def main(args: Array[String]): Unit = {: This line defines the main method, which is the entry point of the program. It takes an array of strings (args) as its parameter and returns Unit (similar to void in other languages).
• println("Result: " + test(3)): This line calls the "test()" function with the argument 3, concatenates the result with the string "Result: ", and prints the entire string to the console.
• println("Result: " + test(14)): Similar to the previous line, this calls the "test()" function with the argument 14.
• println("Result: " + test(12)): Another call to the "test()" function with the argument 12.
• println("Result: " + test(37)): Another call to the "test()" function with the argument 37.

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