C Program to Find Sum of Array Elements.

Problem Statement: Given an array of integers, write a C program to find the sum of all elements in the array.

Example:

Input: arr[] = {1, 2, 3, 4, 5}
Output: Sum of elements: 15

Algorithm to find the Sum of Array Elements.

Below are the steps that we need to follow:

Step 1: Initialize a variable sum to 0 to store the sum of elements.

Step 2: Input the size of the array and create an array arr of that size.

Step 3: Input the elements of the array arr.

Step 4: Traverse through the array from the first element to the last element.

Add each element to the sum variable.

Step 5: Print the value of the sum.

Program to Find Sum of Array Elements.

//C program to find sum of array elements
#include <stdio.h>

int main() {
    int n, sum = 0;

    printf("Enter the size of the array: ");
    scanf("%d", &n);
    
    // Creating an array of size 'n'.
    int arr[n]; 

    // Input the elements of the array 'arr'.
    printf("Enter the elements of the array:\n");
    for (int i = 0; i < n; i++) {
        scanf("%d", &arr[i]);
    }

    // calculate the sum of elements.
    for (int i = 0; i < n; i++) {
        sum += arr[i];
    }

    printf("Sum of elements: %d\n", sum);

    return 0;
}

Output:

Enter the size of the array: 5
Enter the elements of the array:
12 10 5 2 9
Sum of elements: 38

Time Complexity: The time complexity of this code is O(n) since we need to traverse through the entire array once to calculate the sum.

Space Complexity: The space complexity of this code is O(1) because we are not using any extra space to solve this problem except for storing the elements of the input array.

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