What's wrong with my a + b > c condition? [duplicate]

I just wrote this but can never yield the smaller than c result.

#include <iostream>

int main()

{
    double a, b, c;
    std::cin >> a, b, c;
    std::cout << ((a + b > c) ? "BIgger than c" : "Smaller than c");
    ;return 0;
}

I reckon there's a problem at a + b > c. Is there a correct way to write this?