常见语句

• 1.if

let x:i32 = 5;
let y:i32 = if x == 5 {9} else {10};
println!("{}", y);//9

• 2.loop：无限循环

loop{
  println!("forever...");
}

• 3.while

let mut index = 0;
while index < 5 {
  println!("{}", index);
  index++;
}

• 4.for

for variable in expression {

}
for num in 0..10 {
  println!("{}", num);//0~9
}

• 5.enumerate()

for (index, value) in (0..10).enumerate() {
  println!("index = {}, value = {}", index, value);
}
//index = 0, value = 0...

再看一个例子：

let lines = "hello\nworld".lines();
for(linenumber, line) in lines.enumerate() {
  println!("{}: {}", linenumber, line);
}
//0: hello 1: world

• 6.循环标签

fn main(){
  'out for x in 0..10 {
    'inn for y in 0..10 {
      if x % 2 == 0 {continue 'out;}
      if y % 2 == 0 {continue 'inn;}
      println!("{} {}", x, y);
    }
  }
}

END