C Exercises: Check two given arrays of integers of length 1 or more and return true if they have the same first element or they have the same last element

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

35. Array First or Last Element Comparison

Write a C program to check two given arrays of integers of length 1 or more. Return true if they have the same first element or if they have the same last element.

C Code:

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

// Function prototype for 'test'
int test(int nums1[], int nums2[], int arr_size1, int arr_size2);

int main(void){
    // Test case 1
    int array11[] = {10, 20, 40, 50};
    int arr_size11 = sizeof(array11)/sizeof(array11[0]);
    int array12[] = {10, 20, 40, 50};
    int arr_size12 = sizeof(array12)/sizeof(array12[0]);
    printf("%d",test(array11,array12,arr_size11,arr_size12));

    // Test case 2
    int array21[] = {10, 20, 40, 50};
    int arr_size21 = sizeof(array21)/sizeof(array21[0]);
    int array22[] = {11, 20, 40, 51};
    int arr_size22 = sizeof(array22)/sizeof(array22[0]);
    printf("\n%d",test(array21,array22,arr_size21,arr_size22));
}       

// Definition of the 'test' function
int test(int nums1[], int nums2[], int arr_size1, int arr_size2)
{
    // Checking if the first element of the first array is equal to the first element of the second array
    // or if the last element of the first array is equal to the last element of the second array
    return nums1[0] == nums2[0] || nums1[arr_size1 - 1] == nums2[arr_size2 - 1];
}

Sample Output:

1
0

Pictorial Presentation:

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C program to check if two arrays have at least one matching element at the same index.
• Write a C program to determine if two arrays share the same middle element in odd-length arrays.
• Write a C program to verify if two arrays have either the same first element or share a common element anywhere.
• Write a C program to check if the first element of one array matches the last element of another array.

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