Project_Euler#2.c

#include <stdio.h>

int main() 
{
    int sum = 2;
    int a = 1, b = 1, c = a + b;
    while (c < 4000000)
    {
        a = b, b = c, c = a + b;
        if (c % 2 == 0)
            sum += c;
    }
    printf("sum = %d",sum);
    return 0;
}