fn main() {
// Booleans (`bool`)
let is_morning = true;
if is_morning {
println!("Good morning!");
}
let // Finish the rest of this line like the example! Or make it be false!
if is_evening {
println!("Good evening!");
}
}
Solution
fn main() {
// Booleans (`bool`)
let is_morning = true;
if is_morning {
println!("Good morning!");
}
//
let is_evening = true; // Finish the rest of this line like the example! Or make it be false!
if is_evening {
println!("Good evening!");
}
}
fn main() {
// Characters (`char`)
// Note the _single_ quotes, these are different from the double quotes
// you've been seeing around.
let my_first_initial = 'C';
if my_first_initial.is_alphabetic() {
println!("Alphabetical!");
} else if my_first_initial.is_numeric() {
println!("Numerical!");
} else {
println!("Neither alphabetic nor numeric!");
}
let // Finish this line like the example! What's your favorite character?
// Try a letter, try a number, try a special character, try a character
// from a different language than your own, try an emoji!
if your_character.is_alphabetic() {
println!("Alphabetical!");
} else if your_character.is_numeric() {
println!("Numerical!");
} else {
println!("Neither alphabetic nor numeric!");
}
}
Solution
fn main() {
// Characters (`char`)
// Note the _single_ quotes, these are different from the double quotes
// you've been seeing around.
let my_first_initial = 'C';
if my_first_initial.is_alphabetic() {
println!("Alphabetical!");
} else if my_first_initial.is_numeric() {
println!("Numerical!");
} else {
println!("Neither alphabetic nor numeric!");
}
//
let your_character = 'A'; // Finish this line like the example! What's your favorite character?
// Try a letter, try a number, try a special character, try a character
// from a different language than your own, try an emoji!
if your_character.is_alphabetic() {
println!("Alphabetical!");
} else if your_character.is_numeric() {
println!("Numerical!");
} else {
println!("Neither alphabetic nor numeric!");
}
}
fn main() {
let a = ???
if a.len() >= 100 {
println!("Wow, that's a big array!");
} else {
println!("Meh, I eat arrays like that for breakfast.");
panic!("Array not big enough, more elements needed")
}
}
Solution
fn main() {
let a = [0; 100];
//
if a.len() >= 100 {
println!("Wow, that's a big array!");
} else {
println!("Meh, I eat arrays like that for breakfast.");
}
}
#![allow(unused)]
fn main() {
#[test]
fn slice_out_of_array() {
let a = [1, 2, 3, 4, 5];
let nice_slice = ???
assert_eq!([2, 3, 4], nice_slice)
}
}
Solution
#![allow(unused)]
fn main() {
#[test]
fn slice_out_of_array() {
let a = [1, 2, 3, 4, 5];
//
let nice_slice = &a[1..4];
//
assert_eq!([2, 3, 4], nice_slice)
}
}
fn main() {
let cat = ("Furry McFurson", 3.5);
let /* your pattern here */ = cat;
println!("{} is {} years old.", name, age);
}
Solution
fn main() {
let cat = ("Furry McFurson", 3.5);
let (name, age)/* your pattern here */ = cat;
//
println!("{} is {} years old.", name, age);
}
#![allow(unused)]
fn main() {
#[test]
fn indexing_tuple() {
let numbers = (1, 2, 3);
// Replace below ??? with the tuple indexing syntax.
let second = ???;
assert_eq!(2, second,
"This is not the 2nd number in the tuple!")
}
}
Solution
#![allow(unused)]
fn main() {
#[test]
fn indexing_tuple() {
let numbers = (1, 2, 3);
// Replace below ??? with the tuple indexing syntax.
let second = numbers.1;
//
assert_eq!(2, second,
"This is not the 2nd number in the tuple!")
}
}