C Exercises: Check a given array of integers of length 1 or more and return true if the first element and the last element are equal in the given array

Last update on July 28 2025 12:50:07 (UTC/GMT +8 hours)

34. Array Ends Equality Check

Write a C program to check a given array of integers of length 1 or more. Return true if the first element and the last element in the array are equal.

C Code:

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

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

int main(void){
    // Declaring variables
    int arr_size;

    // First test case with an array of integers
    int array1[] = {1, 1, 2, 2, 1};
    arr_size = sizeof(array1)/sizeof(array1[0]);
    printf("%d",test(array1, arr_size));

    // Second test case with a different array of integers
    int array2[] = {1, 1, 2, 1, 2, 3};
    arr_size = sizeof(array2)/sizeof(array2[0]);
    printf("\n%d",test(array2, arr_size));

    // Third test case with another array of integers
    int array3[] =  { 12, 24, 35, 55 };
    arr_size = sizeof(array3)/sizeof(array3[0]);
    printf("\n%d",test(array3, arr_size));
}       

// Definition of the 'test' function
int test(int nums[], int arr_size)
{
    // Checking if the array has at least one element and if the first and last elements are equal
    return arr_size > 0 && nums[0] == nums[arr_size - 1];
}

Sample Output:

1
0
0

Pictorial Presentation:

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C program to check if the first two and last two elements of an array are identical.
• Write a C program to verify if an array's first element is equal to its middle element in an odd-length array.
• Write a C program to determine if an array of integers has the same first and second-to-last element.
• Write a C program to check if both the first and last elements are prime numbers.

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