Example: Array Reversal without Separate Function in C

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// Array Reversal without Separate Function
#include <stdio.h>

int main() {
    // Step 1: Initialize an array
    int arr[] = {100, 200, 300, 400};
    int n = sizeof(arr) / sizeof(arr[0]);

    // Step 2: Print original array
    printf("Original array: ");
    for (int i = 0; i < n; i++) {
        printf("%d ", arr[i]);
    }
    printf("\n");

    // Step 3: Reverse the array directly in main
    int start = 0;
    int end = n - 1;
    while (start < end) {
        // Swap elements
        int temp = arr[start];
        arr[start] = arr[end];
        arr[end] = temp;

        // Move indices
        start++;
        end--;
    }

    // Step 4: Print reversed array
    printf("Reversed array (in main): ");
    for (int i = 0; i < n; i++) {
        printf("%d ", arr[i]);
    }
    printf("\n");

    return 0;
}