password.cpp

利用概率论与随机过程的方法求pi

#include<conio.h>
#include<stdio.h>
#include<stdlib.h>
int judge()
{int c[200],i,j,t=1,d[10]={'0','7','1','1','7','0','0','4','2',13};
clrscr();
printf("Please input your password:\n");
for(i=0;;i++)
{if((c[i]=getch())==13)break;printf("*");}printf("\n");
for(i=0;i<10;i++)
{t=t*(c[i]==d[i]);}
return t;}

void password()
{int i,j,k;
for(j=0;j<3;j++)
 {i=judge();
 if(i==1){printf("Password correct! Access!\n");return;}
 else{if(j==2){printf("You have input the wrong password for three times, press any key to quit:\n");k=getch();exit(0);}
 printf("Password error!\n");loop:printf("Please press a number according to what you want to do:\n1.Reenter your password.\n2.Quit.\n");
 k=getche(); printf("\n");
 if(k=='2') exit(0);
 else if(k!='2'&&k!='1'){printf("You have press a wrong number!\n");goto loop;}
 }
 }
 }

void main()
{int i;
 password();
 printf("!!\n");
 i=getch();}