C：简易控制台版密码验证;

#include <stdio.h>
#include <string.h>
#include <conio.h>
#include <windows.h>

int main(int argc, char** argv){
    char pwd[21]="";
    char ch;
    int i, j;
    system("cls");
    for(i=0;i<3;i++){
        printf("Please type password:n");
        j=0;
        while(j<20&&(ch=getch())!='r'){
            pwd[j++]=ch;
            putchar('*');
        }
        pwd[j]='0';
        if(strcmp(pwd,"123456")==0){
            system("cls");
            printf("Welcome!n");
            getch();
            break;
        }else
            printf("nPassword Error!n");
    }
    if(i>=3){
        printf("n你到底知不知道密码是啥？！n");
        exit(0);
    }
    
    return 0;
    
}