Program to Convert Decimal Numbers to Binary

#include <iostream>
#include <string>

std::string convertTobinary(long num)
{
std::string binaryVal = "";

if(num == 0) return "0";

while(num != 0)
{
if(num %2 == 0)
binaryVal = "0" + binaryVal;
else
binaryVal = "1" + binaryVal;
num /= 2;
}

return binaryVal;
}

int main(int argc, char **argv)
{
std::cout<<"\n binaryVal : "<<convertTobinary(100);
return 0;
}