Breon Thibodeaux - 1 year ago 72

Java Question

`public class Euler2 {`

public static void main(String[] args) {

int Num1 = 0;

int Num2 = 1;

int sum = 0;

do

{

sum = Num1 + Num2;

Num1 = Num2;

Num2 = sum;

if (Num2 % 2 == 0)

sum = sum + Num2;

}

while (Num2 < 4000000);

System.out.println(sum);

}

}

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 don't feel like I coded it wrong but the answer I'm getting is 5702887 and I know it should be 4613732

Answer

```
public class Euler {
public static void main(String[] args) {
int num1 = 0;
int num2 = 1;
int temp = 0;
int sum = 0;
do {
if (num2 % 2 == 0) {
sum = sum + num2;
}
temp = num1 + num2;
Num1 = num2;
Num2 = temp;
} while (num2 < 4000000);
System.out.println(sum);
}
}
```

You messed up the sum by assigning it twice on each iteration where num2 is even. In this solution we use a temporary variable to store the next fibonacci number.

Source (Stackoverflow)