Rust Tutorial : Loops

Definite Loop

the number of iterations of which is definite/fixed is termed as a definite loop
the for loop is an implementation of a definite loop
syntax

for temp_variable in lower_bound..upper_bound {
   //statements
}

example

fn main(){
   for x in 1..11{ // 11 is not inclusive
      if x==5 {
         continue;
      }
      println!("x is {}",x);
   }
}

Indefinite Loop

While Loop
Loop

While Loop

the while loop executes the instructions each time the condition specified evaluates to true
example

fn main(){
   let mut x = 0;
   while x < 10{
      x+=1;
      println!("inside loop x value is {}",x);
   }
   println!("outside loop x value is {}",x);
}

Loop

the loop is a while(true) indefinite loop
example

fn main(){
   //while true

   let mut x = 0;
   loop {
      x+=1;
      println!("x={}",x);

      if x==15 {
         break;
      }
   }
}

break statement is used to take the control out of a construct

Continue Statement

the continue statement skips the subsequent statements in the current iteration
returns the controlto the beginning of the loop
continue does not exit the loop
terminates the current iteration and starts the subsequent iteration
example

fn main() {

   let mut count = 0;

   for num in 0..21 {
      if num % 2==0 {
         continue;
      }
      count+=1;
   }
   println! (" The count of odd values between 0 and 20 is: {} ",count);
   //outputs 10
}

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