程序代码：

#include <stdio.h>
#include <string.h>
void main()
{

 char s[81]="****A*BC*DEF**G******";

 char a[81]="0";

 char *p=s;

 strncpy(a,s,4);
printf("%s\n",s);
printf("===================================\n");

 printf("%s",a);

 while (*p!='\0')

 {
   if(*p!='*')
       printf("%c",*p);

 p++;
}

 printf("\n");
printf("===================================\n");
}