97.在字符串前加入n个*号

函数fun的功能是：在字符串的最前端加入n个*号，形成新串，并且覆盖原串。

#define _CRT_SECURE_NO_WARNINGS#include<stdio.h>#include<string.h>void fun(char s[], int n){char a[80], *p;int i;p = s;for (i = 0;i < n;i++)a[i] = '*';do{a[i] = *p;i++;} while (*p++);a[i] = 0;strcpy(s, a);}int main(){int n;char s[80];printf("\nEnter a string  :");gets(s);printf("\nThe string \"%s\"\n", s);printf("Enter n (number of *)  :  ");scanf("%d", &n);fun(s, n);printf("\nThe string after inster :\"%s\"\n", s);system("pause");return 0;}