#[allow(dead_code)]
#[allow(unused_variables)]

use std::mem;

fn main() {
   let a:u8 = 125; // u = unsigned 0-255 8 bit
    println!("a = {}",a);

    // u unsigned, 0- 2^N-1
    //i signed, -2^(N-1) ----  2^(N-1)-1
    let mut b:i8 = 0; // -128---127

    println!("önce b = {}",b);
    b=22;
    println!("sonra b = {}",b);


    let c = 123456789; //i32 == 32 bit = 4 byte
    println!(" c = {} ve boyutu {}  byte tır.",c,mem::size_of_val(&c));

}