C program for addition of binary numbers

C code for sum of two binary numbers:  

#include<stdio.h>

int main(){

    long int binary1,binary2;

    int i=0,remainder = 0,sum[20];

    printf("Enter any first binary number: ");

    scanf("%ld",&binary1);

    printf("Enter any second binary number: ");

    scanf("%ld",&binary2);

    while(binary1!=0||binary2!=0){

         sum[i++] =  (binary1 %10 + binary2 %10 + remainder ) % 2;

         remainder = (binary1 %10 + binary2 %10 + remainder ) / 2;

         binary1 = binary1/10;

         binary2 = binary2/10;

    }

    if(remainder!=0)

         sum[i++] = remainder;

    --i;

    printf("Sum of two binary numbers: ");

    while(i>=0)

         printf("%d",sum[i--]);

   return 0;

}

Sample output:

Enter any first binary number: 1100011

Enter any second binary number: 1101

Sum of two binary numbers: 1110000