c语言设计密码检测程序？

#include <stdio.h>

#define UC (1U<<1) // upper case

#define LC (1U<<2) // lower case

#define NUM (1U<<3) // 0-9

#define ALL (UC|LC|NUM)

int check(const char pass1[], const char pass2[])

{

const char *p = &pass1[0]

unsigned int flag = 0

if (strlen(pass1) <6 || strlen(pass1) >8)

{

printf("password length is 6 to 8.\n")

return 1

}

if (strcmp(pass1, pass2))

{

printf("the tow passwords are diffrence.\n")

return 2

}

while (*p)

{

if (*p >= 'a' &&*p <= 'z') flag |= LC

else if (*p >= 'A' &&*p <= 'Z') flag |= UC

else if (*p >= '0' &&*p <= '9') flag |= NUM

else

{

printf("in valid charactor: %c.\n", *p)

return 3

}

++p

}

if (flag == ALL) return 0

if ((flag &UC) == 0)

{

printf("lack of uppercase.\n")

}

if ((flag &LC) == 0)

{

printf("lack of lowercase.\n")

}

if ((flag &NUM) == 0)

{

printf("lack of number.\n")

}

return -1

}

int main(int argc, char *argv[])

{

char pass1[100]

char pass2[100]

do {

printf("input password:")

scanf("%s", pass1)

printf("repeat password:")

scanf("%s", pass2)

} while (check(pass1, pass2) != 0)

return 0

}

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#define pi 3.1415926

float area(float s)

void main()

{

char srmima[16],mima[16]="sunshibin1020"

int i=0,j

float r,s

while(1)

{

for(j=0j<30j++)

printf("-")

printf("\n")

printf("请输入密码:")

gets(srmima)

for(j=0j<30j++)

printf("-")

printf("\n")

if(strcmp(srmima,mima)==0)

{

printf("恭喜你，密码正确！\n")

break

}

i++

if(i>2)

{

printf("很遗憾,密码输入错误！\n")

exit(0)

}

}

area(r)

printf("圆面积为：%f",s)

getchar()

}

float area(float r)

{

float s

while(1)

{

printf("\n请输入半径： r:")

scanf("%f",&r)

if (r<0)

break

s=pi*r*r

printf("s=%.2f\n",s)

}

exit(0)

}

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