IO-ProjectsOfficial/cheat-sheet-rust
IO-ProjectsOfficial/cheat-sheet-rust
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feat(basics): cmd, code comments, variables, data types/scalar types

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Jérémi N ‘EndMove’ 2023-07-16 16:34:18 +02:00
parent 704fd7a5d6
commit 1853a72b71
Signed by: EndMove
GPG Key ID: 65C4A02E1F5371A4
1 changed files with 8 additions and 8 deletions
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README.md
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@ -103,20 +103,20 @@ By default in rust **variable are immutable**. If you want to make a variable mu
fn main() { fn main() {
/// Immutable variable (will throw an error) /// Immutable variable (will throw an error)
let x = 5; let x = 5;
println!("The value of x is: {}", x); //! --> The value of x is: 5 println!("The value of x is: {}", x); // --> The value of x is: 5
x = 6; // This will throw an error because x is immutable x = 6; // This will throw an error because x is immutable
//// Mutable variable //// Mutable variable
let mut x = 5; let mut x = 5;
println!("The value of x is: {}", x); //! --> The value of x is: 5 println!("The value of x is: {}", x); // --> The value of x is: 5
x = 6; // This will not throw an error because x is mutable x = 6; // This will not throw an error because x is mutable
println!("The value of x is: {}", x); //! --> The value of x is: 6 println!("The value of x is: {}", x); // --> The value of x is: 6
//// Shadowing variable //// Shadowing variable
let x = 5; let x = 5;
println!("The value of x is: {}", x); //! --> The value of x is: 5 println!("The value of x is: {}", x); // --> The value of x is: 5
let x = x + 1; // This will not throw an error because we are creating a new variable and shadowing the previous one let x = x + 1; // This will not throw an error because we are creating a new variable and shadowing the previous one
println!("The value of x is: {}", x); //! --> The value of x is: 6 println!("The value of x is: {}", x); // --> The value of x is: 6
} }
```` ````
@ -126,7 +126,7 @@ You can also declare a constant variable using the `const` keyword. The **type o
fn main() { fn main() {
//// Constants //// Constants
const HEAL_POINTS: u32 = 100_000 * 5; const HEAL_POINTS: u32 = 100_000 * 5;
println!("The value of HEAL_POINTS is: {}", HEAL_POINTS); //! --> The value of HEAL_POINTS is: 500000 println!("The value of HEAL_POINTS is: {}", HEAL_POINTS); // --> The value of HEAL_POINTS is: 500000
} }
```` ````
@ -138,7 +138,7 @@ fn main() {
fn main() { fn main() {
// Convert a string to integer by specifying the type // Convert a string to integer by specifying the type
let guess: u32 = "42".parse().expect("Not a number!"); // The type mus be specified (u32) let guess: u32 = "42".parse().expect("Not a number!"); // The type mus be specified (u32)
println!("The value of guess is: {}", guess); //! --> The value of guess is: 42 println!("The value of guess is: {}", guess); // --> The value of guess is: 42
} }
```` ````
@ -192,7 +192,7 @@ fn main() {
/// If statements /// If statements
let number: i32 = 3; let number: i32 = 3;
if number < 5 { if number < 5 {
println!("number smaller than 5"); //! --> condition was true println!("number smaller than 5"); // --> condition was true
} else if number > 25 { } else if number > 25 {
println!("number bigger than 25"); println!("number bigger than 25");
} else { } else {