Loops

If we want to execute the block of statements more than once, then loops concept comes under the role. A loop executes the code present inside the loop body till the end and starts again immediately from the starting.

Rust consists of three kinds of loops:

loop

The loop is not a conditional loop. It is a keyword that tells the Rust to execute the block of code over again and again until and unless you explicitly stop the loop manually.

Syntax of loop

 loop{
  //block statements
}

In the above syntax, block statements are executed infinite times.

Flow diagram of loop:

Let's see a simple example of infinite loop

 fn main()
{
  loop
  {
      println!("Hello javaTpoint");
}}

Output:

Hello javaTpoint
Hello javaTpoint
Hello javaTpoint
Hello javaTpoint
.
.
.
infinite times

In this example, "Hello javaTpoint" is printed over and over again until and unless we stop the loop manually. Generally, "ctrl+c" command is used to terminate from the loop.

Termination from loops

The 'Break' keyword is used to terminate from the loop. If 'break' keyword is not used then the loop will be executed infinite times.

Let's see a simple example

 fn main()
{
  let mut i=1;
  loop
  {
        println!("Hello javaTpoint");
        if i==7 
        {
          break;
        }
  i+=1;
  }}

Output:

Hello javaTpoint
Hello javaTpoint
Hello javaTpoint
Hello javaTpoint
Hello javaTpoint
Hello javaTpoint
Hello javaTpoint

In the above example, i is a counter variable, and it is a mutable variable which conveys that the counter variable can be changed for the future use.

Next TopicRust While Loop

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