试验一，04彭得源

#include<stdio.h>
#include<string.h>
main()
{
    char a[10]="help";
    char b[10]="quit";
    char c[10];
    
    while(1){
        printf("please enter the command: ");
        scanf("%s",c);
        if(strcmp(c,a)==0) printf("dir\ncd\nmd\nrd\ncls\ndate\ntime\nren\ncopy");
        if(strcmp(c,b)==0) break;
    }
}