97.在字符串前加入n个*号

#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;
}