Rust: Loops

Status: Courses Tags: Rust

1. Repeating things in Rust can be done using 3 contructs
   1. loop
   2. while
   3. for

loop construct

1. loop is Infinite loop

   #![allow(unused)]
   fn main() {
   let mut x = 1024;
   loop {
   	if x < 0 {
   	  // Break statement to get out of the loop
       // can also use continue in the loop
   		break; 
   	}
   	println!("{} more runs to go", x);
     // Decrement the runs
   	x -= 1; 
   }
   }

2. loop construct can be tagged

   #![allow(unused)]
   fn main() {
   'increment: loop {
   	'decrement: loop {
   	// tags can be used to break out of loops like this 
   		break 'increment; // This will break out of increment loop.  
   	}
   }
   }

while construct

#![allow(unused)]
fn main() {
// Nothing fancy, simple while loop
let x = 1000;
while x > 0 {
	println!("{} more runs to go", x);
	x -= 1
}
}

for construct

#![allow(unused)]
fn main() {
// Simple for loop, to print 0 to 9
for i in 0..10 {
	println!("{}", i);
}

// Simple for loop to print 0 to 10
for i in 0..=10 {
	println!("{}", i)
}
}