if 表達(dá)式
fn main() {
let number = 3;
if number < 5 {
println!("condition was true");
} else {
println!("condition was false");
}
}
使用 else if 處理多重條件
fn main() {
let number = 6;
if number % 4 == 0 {
println!("number is divisible by 4");
} else if number % 3 == 0 {
println!("number is divisible by 3");
} else if number % 2 == 0 {
println!("number is divisible by 2");
} else {
println!("number is not divisible by 4, 3, or 2");
}
}
在 let 語句中使用 if
fn main() {
let condition = true;
let number = if condition {
5
} else {
6
};
println!("The value of number is: {}", number);
}
使用循環(huán)重復(fù)執(zhí)行
loop
fn main() {
loop {
println!("again!");
}
}
while
fn main() {
let mut number = 3;
while number != 0 {
println!("{}!", number);
number = number - 1;
}
println!("LIFTOFF!!!");
}
for
fn main() {
let a = [10, 20, 30, 40, 50];
for element in a.iter() {
println!("the value is: {}", element);
}
}
for 反向
fn main() {
for number in (1..4).rev() {
println!("{}!", number);
}
println!("LIFTOFF!!!");
}
從循環(huán)返回
fn main() {
let mut counter = 0;
let result = loop {
counter += 1;
if counter == 10 {
break counter * 2;
}
};
assert_eq!(result, 20);
}
