Reverse Array in C: Simple Method & Code

To reverse the elements of a C language array, you can achieve this by using a loop and a temporary variable. The specific steps are as follows:

1. Define a temporary variable called temp.
2. Iterate through the array using a loop and exchange elements from both ends towards the middle sequentially.
3. The loop condition can be set for i to start at 0 and increment, and for j to start at the array length minus 1 and decrement, until i is greater than or equal to j.
4. Within the loop, assign the value of arr[i] to temp, then assign the value of arr[j] to arr[i], and finally assign the value of temp to arr[j], completing the element swap.
5. After the loop ends, the elements of the array are reversed.

Here is an example of the code:

#include <stdio.h>

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

int main() {
    int arr[] = {1, 2, 3, 4, 5};
    int n = sizeof(arr) / sizeof(arr[0]);
    
    printf("原数组：");
    for (int i = 0; i < n; i++) {
        printf("%d ", arr[i]);
    }
    
    reverseArray(arr, n);
    
    printf("\n逆置后的数组：");
    for (int i = 0; i < n; i++) {
        printf("%d ", arr[i]);
    }
    
    return 0;
}

Result of operation:

原数组：1 2 3 4 5 
逆置后的数组：5 4 3 2 1