Scala program to find the sum of array elements using a for loop

Last update on February 06 2025 12:40:53 (UTC/GMT +8 hours)

Write a Scala program to find the sum of all elements in an array using a for loop.

Pre-Knowledge (Before you start!)

Basic Scala Syntax: Familiarity with writing and running Scala programs.
Arrays in Scala: Knowledge of creating and working with arrays, including iterating through elements.
For Loops: Understanding how to use for loops to iterate over array elements.
Variable Initialization: Ability to initialize and update variables during program execution.
Arithmetic Operations: Awareness of performing addition to calculate the sum of numbers.
Printing Output: Familiarity with the print() and println() functions to display output on the screen.

Hints (Try before looking at the solution!)

Define the Main Object: Create an object with a main method, which serves as the entry point of the program.
Initialize the Array: Declare and initialize an array containing the numbers whose sum you want to calculate.
Initialize a Sum Variable: Start with a variable initialized to 0 to store the cumulative sum of the array elements.
Use a For Loop: Use a for loop to iterate through each element of the array. Add each element to the sum variable during each iteration.
Display the Array Elements: Use another for loop to print all the elements of the array in a readable format.
Display the Sum: Use println() to print the total sum of the array elements in a clear and formatted manner.
Test with Different Arrays: Change the array values to verify the program works for various cases, including empty arrays or arrays with negative numbers.
Common Errors to Avoid:
- Forgetting to initialize the sum variable correctly, leading to incorrect results.
- Misplacing the addition logic inside the loop, causing incomplete or incorrect calculations.
- Not handling edge cases like empty arrays, which may lead to unexpected behavior.

Sample Solution:

Scala Code:

object ArraySum {
  def main(args: Array[String]): Unit = {
    val numbers: Array[Int] = Array(1, 2, 3, 4, 5, 6) //Array containing the numbers

    var sum: Int = 0
    for (number <- numbers) {
      sum += number
    }
    println("Original Array elements:")
     // Print all the array elements
      for ( x <- numbers ) {
         print(s"${x}, ")        
       }
    println(s"\nThe sum of the array elements is: $sum")
  }
}

Sample Output:

Original Array elements:
1, 2, 3, 4, 5, 6, 
The sum of the array elements is: 21

Explanation:

In the above exercise,

First we define an array "numbers" and initialize it with a sequence of numbers (1, 2, 3, 4, 5, 6 in this case). This array represents the numbers for which we want to calculate the sum.
We initialize a variable sum to 0, which stores the sum of the array elements. Using a for loop, we iterate over each element number in the "numbers" array. Inside the loop, we add the current number to the sum variable.
After the loop finishes, we print the result using println, which displays the sum of all elements in the array.

Scala Code Editor :

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