How to reverse output an array in the C language?

You can use a loop to print the array in reverse order.

Here are the specific steps:

1. First, define an array to store numbers, let’s assume it is called arr.
2. Initialize two variables, start and end, pointing to the first and last elements of the array, respectively.
3. Using a loop, swap elements pointed to by start and end, then move start one position backwards and end one position forward until start is greater than or equal to end.
4. After the loop ends, the entire array will be reversed and outputted.

Here is a sample code:

#include <stdio.h>

void reverseArray(int arr[], int size) {
    int start = 0;
    int end = size - 1;

    while (start < end) {
        int temp = arr[start];
        arr[start] = arr[end];
        arr[end] = temp;

        start++;
        end--;
    }
}

int main() {
    int arr[] = {1, 2, 3, 4, 5};
    int size = sizeof(arr) / sizeof(arr[0]);

    reverseArray(arr, size);

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

    return 0;
}

The output is: 5 4 3 2 1