Space Age

Instructions

Given an age in seconds, calculate how old someone would be on a planet in our Solar System.

One Earth year equals 365.25 Earth days, or 31,557,600 seconds. If you were told someone was 1,000,000,000 seconds old, their age would be 31.69 Earth-years.

For the other planets, you have to account for their orbital period in Earth Years:

In Cairo, where there's no native support for floating-point numbers, we represent fractional values using integers.

This approach is essential in blockchain development to maintain precision in calculations.

In this exercise, we use fixed-point arithmetic by converting orbital periods into microseconds.

For example, Mercury’s orbital period of 0.2408467 Earth years becomes 240,846,700 microseconds by multiplying by 1,000,000.

To account for decimal precision, the test cases assume that the resulting age has two decimal places, represented as integers.

This means that an age of 31.69 years is stored as 3169 in the code.

To achieve this, we multiply by 100 before performing the division.

Here's an example:

let mercury_orbital_period = 240_846_700; // in microseconds
let age_microseconds = age_seconds * 1_000_000;
// multiplying with 100 to retain 2 decimal places
age_microseconds * 100 / mercury_orbital_period

By using this method, you ensure that fractional values are accurately represented as integers while maintaining the required two-decimal precision, which is crucial for the tests to pass.

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Source

Partially inspired by Chapter 1 in Chris Pine's online Learn to Program tutorial.