程式如下：

#include <stdio.h>#include <string.h>#define N 10char str[N];int main(){void sort(char []);int i,flag;for (flag=1;flag==1;) {printf("input string:\n"); scanf("%s",&str); if (strlen(str)>N) printf("string too long,input again!"); else flag=0; }sort(str);printf("string sorted:\n");for (i=0;i<N;i++) printf("%c",str[i]);printf("\n");return 0;}void sort(char str[]){int i,j;char t;for(j=1;j<N;j++) for (i=0;(i<N-j)&&(str[i]!="\0");i++) if(str[i]>str[i+1]) {t=str[i]; str[i]=str[i+1]; str[i+1]=t; }