c036.c

linux 下学习C语言的课堂实用例题

int main()
{
    int x=0,k=0,i=0,j=0;
    char user[20],y[20]="king",passwd[20],z[20]="kkk",l=' ';
    for(i=0;i<3;i++){
		    if(j==3)exit(0);
        memset(user,0,sizeof(user));
        printf("logoin:");
        scanf("%s",&user);
        x=strcmp(user,y);
        if(x!=0) printf("user error!\n");
        else{
            while(j<3){
                j++;
                memset(passwd,0,sizeof(passwd));
                printf("password:");scanf("%s",&passwd);
                k=strcmp(passwd,z);
                if(k!=0) printf("passwd error!\n");
                else{
                    printf("\n\n\n");
                    printf("###############################\n");
                    printf("please  a\n");
                    printf("b   password\n");
                    printf("c   user\n");
                    printf("d   exit\n");
                    printf("###############################\n");
                    while(1){
                        printf("choice:");scanf("%s",&l);
                        switch(l){
                            case 'a': printf("(a) succsesfuly!\n");break;
                            case 'b': printf("(b) password\n");break;
                            case 'c': printf("(c) user\n");break;
                            case 'd': printf("(d) exit!\n");exit(0);
                            default:printf("option error!\n");break; }
				
                    }     
				
            
			         }
            }	
	     }
	 }    
}