ProjectEuler_P2

Question:

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.

 

C Code:

#include <stdio.h>

void main()
{
　　int f1 = 1,f2 = 1;
　　int evensum = 0;
　　while(f2 < 4000000)
　　{
　　　　int temp;
　　　　if(0 == f2%2)
　　　　{
　　　　　　evensum += f2;
　　　　}
　　　　temp = f2;
　　　　f2 += f1;
　　　　f1 = temp;
　　}
　　printf("%d\n",evensum);
}

 

Answer:

4613732