```
let a = 5;
let b = a + 1; //6
let c = a - 1; //4
let d = a * 2; //10
let e = a / 2; // ⭐️ 2 not 2.5
let f = a % 2; //1
let g = 5.0 / 2.0; //2.5
```

```
let a = 1;
let b = 2;
let c = a == b; //false
let d = a != b; //true
let e = a < b; //true
let f = a > b; //false
let g = a <= a; //true
let h = a >= a; //true
// 🔎
let i = true > false; //true
let j = 'a' > 'A'; //true
```

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

🔎 On integer types,

`!`

inverts the individual bits in the two’s complement representation of the value.`let a = !-2; //1 let b = !-1; //0 let c = !0; //-1 let d = !1; //-2`

```
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 b number of 0s to the end of a -> '01'+'00' -> 100)
let g = a >> b; //0 (Remove b number of bits from the end of a -> o̶1̶ -> 0)
```

The `=`

operator is used to assign a name to a value or a function. Compound Assignment Operators are created by composing one of `+ - * / % & | ^ << >>`

operators with `=`

operator.

```
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
a ^= 2; //111 != 010 -> 101 -> 5
a <<= 1; //'101'+'0' -> 1010 -> 10
a >>= 2; //101̶0̶ -> 10 -> 2
```

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

🔎 The `&`

or `&mut`

operators are used for **borrowing** and `*`

operator for **dereferencing**. For more information, refer Ownership, Borrowing & Lifetimes sections.

## Before going to the next…

- About
**string concatenation**,

```
let (s1, s2) = ("some", "thing"); // both &str
// All bellow codes return `String`; something
let s = String::from(s1) + s2; // String + &str
let mut s = String::from(s1); // String
s.push_str(s2); // + &str
let s = format!("{}{}", s1, s2); // &str/String + &str/String
let s = [s1, s2].concat(); // &str or String array
```