/************************/
#include<stdio.h>
int main()
{
    long long int X,O;  
    int Y,Z,I,F;
    printf("please input the Universal Product Code:\n");
    scanf("%d%d%d%d%d%d%d%d%d%d%d\n",&X);
    O=X;
    for(Y=2;Y<12;Y++)
    {
        if(Y%2==0)
        {
            if(X%10==0&&X>10)
            {
                X=X/10;
            }
            else if(X%10!= 0&&X>10)
            {
                Z=Z+X%10;
                X=X/10;
            }
            else if(X%10!=0&&X<10)
            {
                Z=Z+X;        
            }
            
        }
        else if (Y%2!=0)
        {
            if(X%10==0)
            {
                X=X/10;
            }
            else if(X%10!=0)
            {
                I=I+X%10;
                X=X/10;
            }
        }
                        
    }
    F=(3*Z-I)%10;
    O=O*10+F;
    printf("The 12bits UPC=%d",O);
    return 0;
     
     
     
   
}
/************************/

这个解法好厉害，我没想到这么远。但我还想问下就是for循环中    for（unsigned long long tmp=upc....） 中直接可以表明tmp=upc？