#include <stdio.h> char c[100]; int count = 0; int main(){ void antitone(char c[]); int i; printf("请输入字符串:\n"); gets(c); antitone(c); printf("字符串反序存放为:\n"); puts(c) } void antitone(char c[]){ int i; char cha; while(c[count] != '\0') count++; count--;//此时的c[count]是'\0'，所以count-1，'\0'不用交换 for(i = 0;i <= count / 2;i++){ cha = c[i]; c[i] = c[count - i]; c[count - i] = cha; } }