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let a = true;
let b = false;

let c = !a; //false
let d = a && b; //false
let e = a || b; //true

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let a = 1;
let b = 2;

let c = a & b; //0  (01 && 10 -> 00)
let d = a | b; //3  (01 || 10 -> 11)
let e = a ^ b; //3  (01 != 10 -> 11)
let f = a << b; //4  (add 2 positions to the end -> '01'+'00' -> 100)
let g = a >> a; //0  (remove 2 positions from the end -> o̶1̶ -> 0)

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let a = !-2; //1
let b = !-1; //0
let c = !0; //-1
let d = !1; //-2

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let mut a = 2;

a += 5; //2 + 5 = 7
a -= 2; //7 - 2 = 5
a *= 5; //5 * 5 = 25
a /= 2; //25 / 2 = 12 not 12.5
a %= 5; //12 % 5 = 2

a &= 2; //10 && 10 -> 10 -> 2
a |= 5; //010 || 101 -> 111 -> 7

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let a = 15;
let b = (a as f64) / 2.0; //7.5

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$isCron = 'cli' === strtolower(PHP_SAPI);

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screen -S dumindu
pv /home/usera/download/public/db_dump.sql.gz  | gunzip | mysql db_name;
#exit from screen without terminating task
ctrl ad

#to check back
screen -r dumindu

#to terminate 
ctrl d

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//Creating vectors - 2 ways
let mut a = Vec::new(); //1.with new() keyword
let mut b = vec![]; //2.using the vec! macro

//Creating with data types
let mut a2: Vec<i32> = Vec::new();
let mut b2: Vec<i32> = vec![];
let mut b3 = vec![1i32, 2, 3];//sufixing 1st value with data type

//Creating with data

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let mut v = vec![1, 2, 3, 4, 5];

for i in &v {
    println!("A reference to {}", i);
}

for i in &mut v {
    println!("A mutable reference to {}", i);
}

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// Struct Declaration
struct Color {
    red: u8,
    green: u8,
    blue: u8
}

fn main() {
  // creating an instance
  let black = Color {red: 0, green: 0, blue: 0};