函数名: remove 
 功  能: 删除一个文件 
 用  法: #include <stdio.h>
         int remove(char *filename); 
 程序例: 
#include <stdio.h>
int main(void) 
 { 
    char file[80]; 
   /* prompt for file name to delete */ 
    printf("File to delete: "); 
    gets(file); 
   /* delete the file */ 
    if (remove(file) == 0) 
       printf("Removed %s.\n",file); 
    else 
       perror("remove"); 
   return 0; 
 }