C Exercises: Check a given array of integers and return true if the specified number of same elements appears at the start and end of the given array

Last update on March 18 2025 13:24:55 (UTC/GMT +8 hours)

66. Matching Start and End Sequence

Write a C program to check a given array of integers. The program will return true if the specified number of the same elements appears at the start and end of the given array.

C Code:

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

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

int main(void){
    int arr_size;

    // Declaration and initialization of an integer array 'array1'
    int array1[] = {3, 7, 5, 5, 3, 7};
    arr_size = sizeof(array1)/sizeof(array1[0]);

    // Printing the result of the 'test' function for 'array1'
    printf("%d",test(array1, arr_size, 2));

    // Declaration and initialization of an integer array 'array2'
    int array2[] = {3, 7, 5, 5, 3, 7};
    arr_size = sizeof(array2)/sizeof(array2[0]);

    // Printing the result of the 'test' function for 'array2'
    printf("\n%d",test(array2, arr_size, 3));

    // Declaration and initialization of an integer array 'array3'
    int array3[] = {3, 7, 5, 5, 3, 7, 5 };
    arr_size = sizeof(array3)/sizeof(array3[0]);

    // Printing the result of the 'test' function for 'array3'
    printf("\n%d",test(array3, arr_size, 3));
}

// Definition of the 'test' function
int test(int numbers[], int arr_size, int len)
{
    // Looping through the first 'len' elements
    for (int i = 0; i < len; i++)
    {
        // Checking if corresponding elements from the end match
        if (numbers[i] != numbers[arr_size - len + i])
        {
            return 0; // Return 0 if there's a mismatch
        }
    }

    return 1; // Return 1 if all elements match
}

Sample Output:

1
0
1

Pictorial Presentation:

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C program to verify if the first two and last two elements of an array are identical sequences.
• Write a C program to check if an array starts and ends with the same number repeated three times.
• Write a C program to determine if the first half of an array mirrors the second half.
• Write a C program to check if an array’s beginning and ending segments, of a user-defined length, match exactly.

C Programming Code Editor:

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