How to write code in C language to output in reverse or…

Here is a simple C program that can reverse and output a user-inputted string.

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

void reverse(char* str) {
    int len = strlen(str);
    for (int i = len - 1; i >= 0; i--) {
        printf("%c", str[i]);
    }
    printf("\n");
}

int main() {
    char str[100];
    printf("请输入一个字符串：");
    scanf("%s", str);
    printf("逆序输出字符串为：");
    reverse(str);
    return 0;
}

After running the program, users can input a string and the program will output the string in reverse.