C Exercises: Check if the sum of all 5' in the array exactly 15 in a given array of integers

Last update on July 28 2025 12:50:57 (UTC/GMT +8 hours)

56. Sum of 5's Equals 15 Check

Write a C program to check if the sum of all 5's in the array is exactly 15 in a given array of integers.

C Code:

#include <stdio.h>
#include <stdlib.h>

// Function prototype for 'test'
int test(int nums[], int arr_size);

int main(void){
    int arr_size;

    // Declaration and initialization of an integer array 'array1'
    int array1[] = {1, 5, 6, 9, 10, 17};
    arr_size = sizeof(array1)/sizeof(array1[0]);

    // Printing the result of the 'test' function for 'array1'
    printf("%d",test(array1, arr_size));

    // Declaration and initialization of an integer array 'array2'
    int array2[] = {1, 5, 5, 5, 10, 17};
    arr_size = sizeof(array2)/sizeof(array2[0]);

    // Printing the result of the 'test' function for 'array2'
    printf("\n%d",test(array2, arr_size));

    // Declaration and initialization of an integer array 'array3'
    int array3[] = {1, 1, 5, 5, 5, 5};
    arr_size = sizeof(array3)/sizeof(array3[0]);

    // Printing the result of the 'test' function for 'array3'
    printf("\n%d",test(array3, arr_size));
}    

// Definition of the 'test' function
int test(int nums[], int arr_size)
{
    int sum = 0;

    // Looping through the elements of the array
    for (int i = 0; i < arr_size; i++)
    {
        // Checking if the current element is equal to 5
        if (nums[i] == 5)
        {
            sum += 5; // If condition met, add 5 to 'sum'
        }
    }

    return sum == 15; // Return whether 'sum' is equal to 15
}

Sample Output:

0
1
0

Pictorial Presentation:

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C program to check if the sum of all 3's in an array equals 9.
• Write a C program to verify if the total of all occurrences of a specific number equals a target value.
• Write a C program to determine if the sum of all even numbers in an array equals 20.
• Write a C program to check if the sum of all numbers equal to 7 in an array is a multiple of 7.

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