Rust Loop
Loops
The concept of loops comes into play if we wish to run the block of statements more than once. A loop runs the code contained in its body until it reaches its conclusion, at which point it restarts right where it left off.
Rust consists of three kinds of loops:
loop
It is not a conditional loop, is it? This keyword instructs Rust to keep running the code block repeatedly unless you manually end the loop explicitly.
Syntax of loop
loop{
//block statements
}
Block statements are run an unlimited number of times in the syntax above.
Flow diagram of loop:
Example
fn main()
loop
{
println!("Hello javaTpoint");
}
Output:
Hello javaTpoint
Hello javaTpoint
Hello javaTpoint
Hello javaTpoint
.
.
.
infinite times
In this example, until we explicitly end the loop, “Hello javaTpoint” is printed again. The “ctrl+c” command is typically used to end a loop.
Termination from loops
To break out of the loop, use the ‘Break’ keyword. The loop will run endlessly if the ‘break’ keyword is not used.
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
The fact that i is a mutable variable in the example above indicates that the counter variable is subject to change for use in the future.
