Project Euler : Problem #2 - C++ Solution

This time, the problem is:

Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms will be:

1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ...

By considering the terms in the Fibonacci sequence whose values do not exceed four million, find the sum of the even-valued terms.

I'm using a do-while loop here. Here is the code:

#include <iostream>
using namespace std;

int main()
{
    int a = 0, b = 1;
    int c, answer = 0;
    do{
        c = a + b;
        a = b;
        b = c;
        if(b%2==0){answer = answer + b;}
    }while(b<=4000000);
    cout<<"Answer is "<<answer;
    return 0;
}