C Exercises: Check whether a given array of integers contains 5 next to a 5 somewhere

C-programming basic algorithm: Exercise-54 with Solution

Write a C program to check whether a given array of integers contains 5 next to a 5 somewhere.

C Code:

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

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

int main(void){
    // Declaration and initialization of variables
    int arr_size;

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

    // Calculating the size of the array 'array1'
    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, 9, 10, 17};

    // Calculating the size of the array 'array2'
    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, 5, 5, 9, 10, 17, 5, 5};

    // Calculating the size of the array 'array3'
    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)
{
    // Looping through the elements of the array
    for (int i = 0; i < arr_size - 1; i++)
    {
        // Checking if the current element and the next element are both 5
        if (nums[i] == 5 && nums[i] == nums[i + 1])
        {
            return 1; // If condition met, return 1 (true)
        }
    }

    return 0; // If condition not met for any pair, return 0 (false)
}

Sample Output:

0
1
1

Pictorial Presentation:

Flowchart:

C Programming Code Editor:

Previous: Write a C program to compute the sum of the numbers in a given array except those numbers starting with 5 followed by atleast one 6. Return 0 if the given array has no integer.
Next: Write a C program to check whether a given array of integers contains 5's and 7's.