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Project Euler: Problem 2: Even Fibonacci Numbers - fiboEvenSum(10) sh… (#34722)

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Rohan Mohammad
2019-01-19 15:20:53 +05:30
committed by Kristofer Koishigawa
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curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-2-even-fibonacci-numbers.english.md
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@ -8,7 +8,7 @@ title: 'Problem 2: Even Fibonacci Numbers'
<section id='description'> <section id='description'>
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: 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:
<div style='text-align: center;'>1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ...</div> <div style='text-align: center;'>1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ...</div>
By considering the terms in the Fibonacci sequence whose values do not exceed <code>n</code>th term, find the sum of the even-valued terms. By considering the terms in the Fibonacci sequence that do not exceed the <code>n</code>th term, find the sum of the even-valued terms.
</section> </section>
## Instructions ## Instructions
@ -21,16 +21,16 @@ By considering the terms in the Fibonacci sequence whose values do not exceed <c
```yml ```yml
tests: tests:
- text: <code>fiboEvenSum(10)</code> should return 188. - text: <code>fiboEvenSum(10)</code> should return 44.
testString: assert.strictEqual(fiboEvenSum(10), 188, '<code>fiboEvenSum(10)</code> should return 188.'); testString: assert.strictEqual(fiboEvenSum(10), 44, '<code>fiboEvenSum(10)</code> should return 44.');
- text: <code>fiboEvenSum(18)</code> should return 3382.
testString: assert.strictEqual(fiboEvenSum(18), 3382, '<code>fiboEvenSum(18)</code> should return 3382.');
- text: <code>fiboEvenSum(23)</code> should return 60696. - text: <code>fiboEvenSum(23)</code> should return 60696.
testString: assert.strictEqual(fiboEvenSum(23), 60696, '<code>fiboEvenSum(23)</code> should return 60696.'); testString: assert.strictEqual(fiboEvenSum(23), 60696, '<code>fiboEvenSum(23)</code> should return 60696.');
- text: <code>fiboEvenSum(43)</code> should return 1485607536. - text: <code>fiboEvenSum(43)</code> should return 350704366.
testString: assert.strictEqual(fiboEvenSum(43), 1485607536, '<code>fiboEvenSum(43)</code> should return 1485607536.'); testString: assert.strictEqual(fiboEvenSum(43), 350704366, '<code>fiboEvenSum(43)</code> should return 350704366.');
- text: Your function is not returning the correct result using our tests values.
testString: assert.strictEqual(fiboEvenSum(18), 3382, 'Your function is not returning the correct result using our tests values.');
- text: Your function should return an <code>even</code> value. - text: Your function should return an <code>even</code> value.
testString: assert.equal(fiboEvenSum(31) % 2 === 0, true, 'Your function should return an <code>even</code> value.'); testString: assert.equal(fiboEvenSum(10) % 2 === 0, true, 'Your function should return an <code>even</code> value.');
``` ```
@ -62,18 +62,20 @@ fiboEvenSum(10);
```js ```js
const fiboEvenSum = (number) => { const fiboEvenSum = (number) => {
let temp, sum = 0, a = 0, b = 1; if (number <= 1) {
while (number >= 0) { return 0;
temp = a; } else {
a = b; let evenSum = 2, first = 1, second = 2, fibNum; // According to problem description our Fibonacci series starts with 1, 2
b += temp; for (let i = 3; i <= number; i++) {
number --; fibNum = first + second;
if ((b % 2) === 0) { first = second;
sum += b; second = fibNum;
if (fibNum % 2 == 0) {
evenSum += fibNum;
}
} }
} return evenSum;
}
return sum;
} }
``` ```