密码保存在文件中，从文件中读取密码，但是没做容错和异常处理，仅供参考

#include

#include

#define PSDLEN 6

void inputPsd(char *str) /*处理输入*/

{

int i;

for(i = 0; i < PSDLEN; i++)

{

while(1)

{

str[i] = getch();

if(str[i] == '\b') /*处理退格键*/

{

i--;

if(i < 0)

{

i = 0;

}

else

{

printf("\b \b");

}

continue;

}

else if(str[i] == '\r') /*处理回车键*/

{

continue;

}

else

{

printf("*");

break;

}

}

}

str[i] = '\0';

printf("\n");

}

int checkFirst() /*检测是否是第一次使用*/

{

FILE *fp;

if((fp = fopen("psd.dat", "rb")) == NULL)

{

return 1;

}

fclose(fp);

return 0;

}

void firstUse() /*第一次使用 需要输入密码*/

{

FILE *fp;

int i;

char passwd[PSDLEN + 1];

char checkPsd[PSDLEN + 1];

if((fp = fopen("psd.dat", "wb")) == NULL)

{

printf("Creat password error!\n");

exit(1);

}

while(1)

{

printf("Please input password:");

inputPsd(passwd);

printf("\nPlease input password again:");

inputPsd(checkPsd);

if(!strcmp(passwd, checkPsd))

{

break;

}

printf("\ncheck password error! \n");

}

fwrite(passwd, sizeof(char), PSDLEN, fp);

fclose(fp);

}

void login() /*核对密码，并登录*/

{

FILE *fp;

int i, num = 3;

char passwd[PSDLEN + 1];

char checkPsd[PSDLEN + 1];

if((fp = fopen("psd.dat", "rb")) == NULL)

{

puts("Open psd.dat error");

exit(1);

}

fread(passwd, sizeof(char), PSDLEN, fp);

fclose(fp);

passwd[PSDLEN] = '\0';

printf("Please input password to login");

while(num)

{

printf("you have %d chances to cry:\n", num);

inputPsd(checkPsd);

if(!strcmp(passwd, checkPsd))

{

break;

}

puts("\npassword error,Please input again");

num--;

}

if(!num)

{

puts("Press any key to exit...");

getch();

exit(0);

}

else

{

puts("\n--------\nWelcome!\n--------\n");

}

}

void main()

{

if(checkFirst())

{

firstUse();

}

else

login();

getch();

}

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