身分證驗證

 #include<stdio.h>  

#include<stdlib.h>

#include<string.h>//標頭檔要字串.h 

main()

{

int sum,temp;

char id_num[10];

scanf("%s",&id_num);//要%s字串 

switch(id_num[0])

{

case 'A':sum=1;break;

case 'B':sum=10;break;

case 'C':sum=19;break;

case 'D':sum=28;break;

case 'E':sum=37;break;

case 'F':sum=46;break;

case 'G':sum=55;break;

case 'H':sum=64;break;

case 'I':sum=39;break;

case 'J':sum=73;break;

case 'K':sum=82;break;

case 'L':sum=2;break;

case 'M':sum=11;break;

case 'N':sum=20;break;

case 'O':sum=48;break;

case 'P':sum=29;break;

case 'Q':sum=38;break;

case 'R':sum=47;break;

case 'S':sum=56;break;

case 'T':sum=65;break;

case 'U':sum=74;break;

case 'V':sum=83;break;

case 'W':sum=21;break;

case 'X':sum=3;break;

case 'Y':sum=12;break;

case 'Z':sum=30;break;

}

temp=sum+

8*(id_num[1]-48)+

7*(id_num[2]-48)+

6*(id_num[3]-48)+

5*(id_num[4]-48)+

4*(id_num[5]-48)+

3*(id_num[6]-48)+

2*(id_num[7]-48)+

1*(id_num[8]-48)+

1*(id_num[9]-48);

if(temp%10==0)

{

printf("合法");

}

else

{

printf("不合法");

}

return 0;    

}