设置s中的所有字节为ch, s数组的大小由n给定

[c]代码库

#include <string.h> 
#include <stdio.h> 
#include <mem.h> 

int main(void) 
{ 
   char buffer[] = "Hello world\n"; 

   printf("Buffer before memset: %s\n", buffer); 
   memset(buffer, '*', strlen(buffer) - 1); 
   printf("Buffer after memset:  %s\n", buffer); 
   return 0; 
}