fn main()
{
    const PI:f32=3.14;
    let r=5;
    let r=r as f32;
    println!("———————————————————————————————————————————");
    println!("Program to calculate the area and circumference of a circle");
    println!("———————————————————————————————————————————");
    println!("The area of a circle is  {c}",c=PI*r*r);
    println!("The circumference of a circle is {c}",c=2.0*PI*r);
    println!("———————————————————————————————————————————");
}

codeaft@codeaft:~$ rustc codeaft.rs
codeaft@codeaft:~$ ./codeaft
———————————————————————————————————————————
Program to calculate the area and circumference of a circle
———————————————————————————————————————————
The area of a circle is  78.5
The circumference of a circle is 31.400002
———————————————————————————————————————————
codeaft@codeaft:~$