Reverse String in C: Simple Guide

We can use a loop to reverse the order of the string. First, calculate the length of the string, then create a new character array with the same length as the original string. Next, use a loop to iterate through the original string from back to front, assigning each character to the new character array. Finally, output the new character array.

Here is an example code:

#include <stdio.h>
#include <string.h>

void reverseString(char* str) {
    int len = strlen(str);
    char reverse[len + 1]; // 创建新的字符数组
    int i, j;

    // 逆序赋值给新的字符数组
    for (i = len - 1, j = 0; i >= 0; i--, j++) {
        reverse[j] = str[i];
    }
    reverse[len] = '\0'; // 添加字符串结束符

    printf("逆序字符串: %s\n", reverse);
}

int main() {
    char str[] = "Hello, World!";
    printf("原字符串: %s\n", str);

    reverseString(str);

    return 0;
}

Output result:

原字符串: Hello, World!
逆序字符串: !dlroW ,olleH