身分證練習

 #include <stdio.h>

#include <stdlib.h>

#include <string.h>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

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

 {

  int temp ,sum;

  char id_num[10];

  scanf("%s",&id_num[0]);

  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\n");

}

else

{

printf("不合法\n");

}

return 0;

}