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86 lines
3.0 KiB
86 lines
3.0 KiB
3 years ago
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# Assembly Line
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Welcome to Assembly Line on Exercism's Rust Track.
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If you need help running the tests or submitting your code, check out `HELP.md`.
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If you get stuck on the exercise, check out `HINTS.md`, but try and solve it without using those first :)
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## Introduction
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## numbers
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There are two different categories of numbers in Rust.
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The name of a numeric type consists of two parts:
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- A letter to specify whether it's a floating-point number (f), unsigned integer (u) or signed integer (i)
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- A number to specify the numbers size in bits. Larger types have a greater range between minimum and maximum values.
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For floating points it will also allow for more numbers behind the decimal separator.
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The following combinations are possible:
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- 8 bits: `u8`, `i8`
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- 16 bits: `u16`, `i16`
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- 32 bits: `u32`, `i32`, `f32`
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- 64 bits: `u64`, `i64`, `f64`
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- 128 bits: `u128`, `i128`
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Note that there are only 32-bits and 64-bits variants for floating-point numbers.
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## Integers
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- Integers: numbers with no digits behind the decimal separator (whole numbers).
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Integer types can either store only positive numbers (unsigned) or store either positive and negative numbers (signed).
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Examples are -6, 0, 1, 25, 976 and 500000.
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## Floating Point Numbers
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- Floating-point numbers: numbers with zero or more digits behind the decimal separator.
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Examples are -2.4, 0.1, 3.14, 16.984025 and 1024.0.
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## Converting between number types
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Rust doesn't do any implicit type conversion.
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This means that if you need to turn one numeric type into another, you have to do so explicitly.
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When converting from a larger type to a smaller one (for instance `u64` to `u32`) you could lose data.
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Converting from a floating point to an integer **will** lose everything behind the decimal point, effectively rounding down.
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## Instructions
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In this exercise you'll be writing code to analyze the production of an assembly line in a car factory. The assembly line's speed can range from `0` (off) to `10` (maximum).
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At its lowest speed (`1`), `221` cars are produced each hour. The production increases linearly with the speed. So with the speed set to `4`, it should produce `4 * 221 = 884` cars per hour. However, higher speeds increase the likelihood that faulty cars are produced, which then have to be discarded. The following table shows how speed influences the success rate:
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- `1` to `4`: 100% success rate.
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- `5` to `8`: 90% success rate.
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- `9` and `10`: 77% success rate.
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You have two tasks.
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## 1. Calculate the production rate per hour
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Implement a method to calculate the assembly line's production rate per hour, taking into account its success rate:
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```rust
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numbers::production_rate_per_hour(6)
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// Returns: 1193.4
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```
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Note that the value returned is an `f64`.
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## 2. Calculate the number of working items produced per minute
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Implement a method to calculate how many working cars are produced per minute:
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```rust
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numbers::working_items_per_minute(6)
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// Returns: 19
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```
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Note that the value returned is an `u32`.
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## Source
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### Created by
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- @LewisClement
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- @efx
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