pc-ip-20.c

Metadata

• Author — Amit Dutta
• Last updated — 05 Jan 2026
• License — MIT License (See the LICENSE file for details)

Problem Statement

Problem Statement

Question 20: Write a C program that defines an array of integers, and includes a user-defined function named reverseArray with the signature void reverseArray(int arr[], int size);.

Source Code

View on GitHub Download Raw

Printing the code

To print this file, open it on GitHub and click Raw before printing, or use the Download Raw button above and print directly from that page.

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

void inputArray(int [], int);
void reverseArray(int [], int);
void printArray(int [], int);

int main() {
    int n, *arr = NULL;
    printf("How many element do you want enter: ");
    scanf("%d", &n);
    arr = (int *)malloc(n * sizeof(int));
    if(arr == NULL) {
        printf("\nMemory allocation failed.");
        return 1;
    }
    inputArray(arr, n);
    printf("\nBefore Reverse: ");
    printArray(arr, n);
    reverseArray(arr, n);
    printf("\nAfter reverse: ");
    printArray(arr, n);
    free(arr);
    return 0;
}

void inputArray(int arr[], int n) {
    int i;
    for(i = 0; i < n; i++) {
        printf("Enter element %d: ", i + 1);
        scanf("%d", &arr[i]);
    }
}

void printArray(int arr[], int n) {
    int i;
    printf("[");
    for(i = 0; i < n; i++) {
        printf("%d", arr[i]);
        if(i < n - 1) {
            printf(", ");
        }
    }
    printf("]");
}

void reverseArray(int arr[], int size) {
    int i = 0;
    int j = size - 1;
    int temp;
    while(i < j) {
        temp = arr[i];
        arr[i] = arr[j];
        arr[j] = temp;
        i++;
        j--;
    }
}