Sum of elements in an array in Java

Sum of elements in an array in Java with Logic and code example.

Consider an integer array as an example,

int[] x = { 6, 7, 2 };  //Sum of all elements of the array is 15.

LOGIC:

Simply retrieve each elements of the integer array by traversing the array using a for loop till the last elements. And in the loop, itself, during retrieval of each element keep adding them.

CODE EXAMPLE:

public class ArraySum {

	public static void main(String[] args) {

		int x[] = { 6, 7, 2 };

		int sum = 0;

		/* Retrieve each elements and keep summing. */
		for (int i = 0; i < x.length; i++) {

			sum += x[i];
			// Also can be written as sum = sum + x[i];
		}
		System.out.println("sum=" + sum);

	}
}

OUTPUT
Sum=15


TEST CASES
int x[] = { 6, -7, 2 };

Sum=1


int x[] = { -6, -7, -2 };
Sum=-15

MODULAR CODE – SUM OF ARRAY ELEMENTS IN JAVA

To modularize the program, you can create a separate method that takes an integer array, find sum of array elements and return the sum of the numbers of the array to the calling point.

CODE:

// Java program to find sum of array elements

public class ArraySum {

	public static void main(String[] args) {

		int x[] = { 6, 7, 2 };

		int sum = getSum(x);

		System.out.println("sum=" + sum);

	}

	public static int getSum(int arr[]) {
		int sum = 0;

		for (int i = 0; i < arr.length; i++) {

			sum += arr[i];
		}

		return sum;

	}
}



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