C++ - Decimal to binary converting

Question

I wrote a \'simple\' (it took me 30 minutes) program that converts decimal number to binary. I am SURE that there\'s a lot simpler way so can you show me? Here\'s the code:<

Answer 1

#include 
using namespace std;

int main()
{  
    int a,b;
    cin>>a;
    for(int i=31;i>=0;i--)
    {
        b=(a>>i)&1;
        cout<