oj_demo1/148 字符反转.c

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

void swap(char *a, char *b) {
    char tmp;
    tmp = *b;
    *b = *a;
    *a = tmp;
}


int main() {
    char s[50] = {0};
    scanf("%s", s);
    unsigned long i = strlen(s);
    for (int j = 0; j < i / 2; ++j) {
        swap(&s[j], &s[i - j - 1]);
    }
    printf("%s\n", s);
    return 0;
}