number to binary

#include<stdio.h>
int main()
{
     int a,a1,a2,a3,a4,a5,a6,a7,a8,b,b1,b2,b3,b4,b5,b6,b7;
     scanf("%d",&a);
     printf("The number is %d\t",a);
     b=a%2;
     a1=a/2;

     b1=a1%2;
     a2=a1/2;

     b2=a2%2;
     a3=a2/2;

     b3=a3%2;
     a4=a3/2;

     b4=a4%2;
     a5=a4/2;

     b5=a5%2;
     a6=a5/2;

     b6=a6%2;
     a7=a6/2;

     b7=a7%2;
     a8=a7/2;

     printf("%d%d%d%d%d%d%d%d\n",b7,b6,b5,b4,b3,b2,b1,b);
     printf("The last number is %d\n",a8);
     return 0;
}