Write before:
Have you ever feel amazed when you settle to think about the principles when you entering your password?
I haver always been curious about that.
So lets' uncover the mystery now!
#include <stdio.h> #include <conio.h> #define MAX_PSD_LEN 20 char PassWord[MAX_PSD_LEN],*p=PassWord,ch; int count=0; main() { ch=getch(); while(ch!=13&&count<MAX_PSD_LEN-1) /*当按下回车键或密码长度达到19,则退出循环*/ { if(ch==8) /*如果按下的是向前删除键,则...*/ { if(count) /*如果密码串中字符数大于零,则向前删除一个字符*/ { p--; count--; printf("\b ");/*光标回退一格,将星号(*)改为空格*/ printf("\b"); /*光标重新回退一格*/ } } else if((ch<='Z'&&ch>='A')||(ch<='z'&&ch>='a')||(ch<='9'&&ch>='0')) /*如果输入的是密码的有效字符*/ { printf("*"); /*输出一个星号*/ count++; *p=ch; /*记录密码内容*/ p++; } ch=getch(); /*等待输入下一个字符*/ } PassWord[count]=0; printf("\nThe Password you input is:\n"); printf("%s\n",PassWord); }
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27 | 28 | 29 | 30 | 31 | 1 | 2 |
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24 | 25 | 26 | 27 | 28 | 29 | 30 |