#include <stdlib.h>
#include <stdio.h>
#include <math.h>

// compile with:
//         gcc prog_long_long.c -o prog_long_long.exe
// run with:
//         prog_long_long

unsigned long long int dec2bin(unsigned long long int);

int main(){
    unsigned long long int d,result;

    printf("Enter an Integern");

    scanf("%llu", &d);

    result = dec2bin(d);

    printf("The number in binary is %llun",result);

    system("pause");

    return 0;
}

unsigned long long int dec2bin(unsigned long long int n){
     unsigned long long int rem;
     unsigned long long int bin=0;
     int i=1;
     while(n!=0){
                 rem = n%2;
                 n = n/2;
                 bin = bin+(rem*i);
                 i = i*10;
     }
     return bin;
}