Reverse an Array Using Only Pointers

Code

#include <stdio.h>

void swarp_number(int* number_a, int* number_b) {
    int temp = *number_a;
    *number_a = *number_b;
    *number_b = temp;
}

void reverse_array(int *ptr, int n) {
    int* ptr_current_start = ptr;
    int* ptr_current_end = ptr + (n - 1);

    while (ptr_current_start < ptr_current_end) {
        swarp_number(ptr_current_start, ptr_current_end);
        ptr_current_start++;
        ptr_current_end--;
    }
}

int main() {
    int n;
    scanf("%d", &n);

    int arr[100];
    for (int i = 0; i < n; i++) {
        scanf("%d", &arr[i]);
    }

    reverse_array(arr, n);

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

    return 0;
}

Solving Approach

 

 

 

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Input

5 1 2 3 4 5

Expected Output

5 4 3 2 1