Java Program to find sum of array elements

Program

import java.util.Scanner;
public class SumOfArrayElements {
  public static void main(String[] args) {
    System.out.println("Enter the required size of the array: ");
    Scanner reader = new Scanner(System.in);
    int size = reader.nextInt();
    Integer inputArray[] = new Integer[size];
    System.out.println("Enter the elements of the array: ");
    for (int i = 0; i < size; i++) {
      inputArray[i] = reader.nextInt();
    }
    double sum = 0;
    double average = 0;
    for (int i = 0; i < size; i++) {
      sum = sum + inputArray[i];
    }
    System.out.println("Sum of given numbers is: " + sum);
  }
}

This Java program calculates the sum of all elements in an array.

1. Input from User:

   • The user is prompted to input the size of the array (size).
   • A Scanner object (reader) is used to take input.
   • An array inputArray[] of size size is created to store the elements.
   • The user is prompted to input the elements of the array, which are stored in inputArray.

2. Sum Calculation:

   • A variable sum is initialized to 0.
   • A for loop iterates through the array, adding each element to sum.

3. Output:

   • After the loop, the total sum is printed to the console using System.out.println().

Key Points:

• Sum Logic:
  • The program uses a simple for loop to traverse the array and accumulate the sum of its elements.
• Type Handling:
  • The program uses a double type for sum to handle cases where the user modifies the program to deal with decimal values, even though the input is restricted to integers.
• Scalability:
  • Works for any size of the array as specified by the user.

Output

javac .\SumOfArrayElements.java
java SumOfArrayElements
Enter the required size of the array: 
5
Enter the elements of the array: 
10
20
30
40
50
Sum of given numbers is: 150.0