Project Euler, Fibonacci Sequence Solution

Euler2.cpp

#include <iostream>
using namespace std;
 
int main()
{
    
    int a,      // holds first term
        b,      // holds second term
        c,      // holds third term
        sum;    // holds sum
    
    const int SIZE = 4000000;
 
    // Initialize first two Fibonacci terms
    a = 1;
    b = 2;
    
    // Initialize sum
    sum = 0;
   
    do {
          
        if (b%2 == 0) {
            sum+=b;
        }
            
        c = a + b;
        a = b + c;
        b = c + a;
        
 
    } while (c <= SIZE);
   
    cout << sum << endl;
   
    return 0;
}