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95 lines
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3.2 KiB
Markdown
95 lines
No EOL
3.2 KiB
Markdown
# Pacman Rules
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Welcome to Pacman Rules on Exercism's C++ 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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Booleans in C++ are represented by the `bool` type.
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A `bool` is either `true` or `false`.
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## Logical Operators
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C++ supports three boolean operators: `!` (NOT), `&&` (AND), and `||` (OR).
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You can also use the alternative versions `not`, `and`, and `or`.
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```cpp
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true || false // => true
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true && false // => false
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!true // => false
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not false // => true
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```
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## Precedence
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The three boolean operators each have different _operator precedence_.
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As a consequence, they are evaluated in this order: `!` first, `&&` second, and finally `||`.
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If you want to force a different ordering, you can enclose a boolean expression in parentheses (ie. `()`), as the parentheses have even higher operator precedence.
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```cpp
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!true && false // => false
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!(true and false) // => true
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```
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~~~~exercism/advanced
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## Conversion
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If you use `true` or `false` in a place where a number is expected, they will be converted to `1` and `0` respectively.
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If you use a number in a Boolean operation, everything except `0` is treated as `true` - even negative values.
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```cpp
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!true && 0.0 // => false
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true + true + false // => 2
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```
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~~~~
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## Instructions
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In this exercise, you need to translate some rules from the classic game Pac-Man into C++ functions.
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You have four rules to translate, all related to the game states.
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> Don't worry about how the arguments are derived, just focus on combining the arguments to return the intended result.
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## 1. Define if Pac-Man eats a ghost
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Define the `can_eat_ghost` function that takes two arguments (_if Pac-Man has a power pellet active_ and _if Pac-Man is touching a ghost_) and returns a boolean value if Pac-Man is able to eat the ghost. The function should return true only if Pac-Man has a power pellet active and is touching a ghost.
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```cpp
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can_eat_ghost(false, true);
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// => false
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```
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## 2. Define if Pac-Man scores
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Define the `scored` function that takes two arguments (_if Pac-Man is touching a power pellet_ and _if Pac-Man is touching a dot_) and returns a boolean value if Pac-Man scored. The function should return true if Pac-Man is touching a power pellet or a dot.
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```cpp
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scored(true, true);
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// => true
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```
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## 3. Define if Pac-Man loses
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Define the `lost` function that takes two arguments (_if Pac-Man has a power pellet active_ and _if Pac-Man is touching a ghost_) and returns a boolean value if Pac-Man loses. The function should return true if Pac-Man is touching a ghost and does not have a power pellet active.
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```cpp
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lost(false, true);
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// => true
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```
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## 4. Define if Pac-Man wins
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Define the `won` function that takes three arguments (_if Pac-Man has eaten all of the dots_, _if Pac-Man has a power pellet active_, and _if Pac-Man is touching a ghost_) and returns a boolean value if Pac-Man wins. The function should return true if Pac-Man has eaten all of the dots and has not lost based on the arguments defined in part 3.
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```cpp
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won(false, true, false);
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// => false
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```
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## Source
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### Created by
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- @vaeng |