Rust While Loop

The 'while-loop' is a conditional loop. When a program needs to evaluate a condition then the conditional loop is used. When the condition is true then it executes the loop otherwise it terminates the loop.

Syntax of 'while loop'

while condition  
  
//block statements;  

In the above syntax, while loop evaluates the condition. If the condition is true, block statements are executed otherwise it terminates the loop. Rust provides this inbuilt construct which can be used in combinations with 'loop', 'if', 'else' or 'break' statement.

 fn main()  
{  
  let mut i=1;  
  while i<=10  
{  
   print!("{}", i);  
   print!(" ");  
   i=i+1;  
}  
}  

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In the above example, 'i' is a mutable variable means that the value of 'i' can be modified. The while loop executes till the value of 'i' is less than 10 or equal to 10.

 fn main()  
{  
  let array=[10,20,30,40,50,60];  
  let mut i=0;  
  while i< 6  
  {  
    print!("{}",array[i]);  
    print!(" ");  
    i=i+1;  
  }  
}  

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