Problem #2

 #include <iostream>
using namespace std;

void sumOfFibonacciEven(){
    int sum,num,prev=0;
    int curr=1;
    while(curr<4000000){
        if (curr%2==0){sum+=curr;}
        num=prev+curr;
        prev=curr;
        curr=num;
    }
    cout<<"Sum:"<<sum<<endl;
}

int main()
{
    sumOfFibonacciEven();
    return 0;
}