﻿ C : Array of two 5s next to each other or separated by one

# C Exercises: Check a given array of integers and return true if the given array contains two 5's next to each other, or two 5 separated by one element

## C-programming basic algorithm: Exercise-61 with Solution

Write a C program to check a given array of integers. The program will return true if the given array contains two 5's next to each other, or two 5's separated by one element.

C Code:

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

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

int main(void){
int arr_size;

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

// 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[] = {2, 7, 8, 10};
arr_size = sizeof(array2)/sizeof(array2);

// 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[] = {3, 3, 3, 5, 7, 5};
arr_size = sizeof(array3)/sizeof(array3);

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

// Definition of the 'test' function
int test(int numbers[], int arr_size)
{
int len = arr_size;

// Looping through the elements of the array
for (int i = 0; i < len - 1; i++)
{
// Checking if the current element and the next element are both 5
if (numbers[i] == 5 && numbers[i + 1] == 5)
return 1;

// Checking if the current element, the element after the next one, and the next element are all 5
if (i + 2 < len && numbers[i] == 5 && numbers[i + 2] == 5)
return 1;
}

// If no consecutive pairs of 5 were found
return 0;
}
``````

Sample Output:

```1
0
1
```

Pictorial Presentation: Flowchart: C Programming Code Editor:

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