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!
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | #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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日 | 一 | 二 | 三 | 四 | 五 | 六 |
26 | 27 | 28 | 29 | 30 | 31 | 1 |
2 | 3 | 4 | 5 | 6 | 7 | 8 |
9 | 10 | 11 | 12 | 13 | 14 | 15 |
16 | 17 | 18 | 19 | 20 | 21 | 22 |
23 | 24 | 25 | 26 | 27 | 28 | 1 |