求助这个有问题不，大神

#include<stdio.h>
void main()
{
int a1,a2,a3,a4,a5,a6,b1,b2,b3,b4,b5,b6;
printf("Enter the first (single) digit:");
scanf("%d",&a1);
printf("Enter first group of five digits:");
scanf("%d%d%d%d%d",&a2,&a3,&a4,&a5,&a6);
printf("Enter second group of five digits:");
scanf("%d%d%d%d%d",&b1,&b2,&b3,&b4,&b5);
b6=9-((a1+a3+a5+b1+b2+b5)*3+a2+a4+a6+b2+b4-1)%10;
printf("Check digit:%d\n",b6);
getchar();
}