## 1. Python integer values

In Python, an `int`

or integer is:

- a whole number without decimal
- positive, negative or zero
- of unlimited length
- may contain underscores to improve readability

x = 10 y = 12345678987654321 z = 12_34_56 print(x) # 10 print(y) # 12345678987654321 print(z) # 123456

## 2. Integers can be octal and hex

In python, we can represent the integers in the octal or hexadecimal representation also.

- Octal and hexadecimal numbers can be negative, but cannot be written in the exponential form.
- Octals are prefixed with
`'0o'`

(zero followed by the letter “o”) and contains digits from 0 to 7. - Hexadecimals prefixed with
`'0x'`

(zero followed by the letter “x” – uppercase or lowercase) and contains digits from 0 to 9 or letters from A to F (uppercase or lowercase).

octalInt = 0o22 hexInt = 0xAA print(octalInt) # 18 print(hexInt) # 170

## 3. Arithmetic operations

#### 3.1. Addition, subtraction, multiplication and devision

These operations are pretty much similar to other languages.

The standard operation of division, which is performed by the

`/`

operator, generally returns a floating-point result. Use thefloor divisionoperator`//`

to remove the digits after the decimal point.

`x / y`

: returns quotient of x and y`x // y`

: returns (floored) quotient of x and y`x % y`

: remainder of x / y`divmod(x, y)`

: the pair (x // y, x % y)

x = 22 y = 5 print (x + y) # Prints 27 print (x - y) # Prints 17 print (x * y) # Prints 110 print (x / y) # Prints 4.4 print (x // y) # Prints 4 print (x % y) # Prints 2 print ( divmod(x, y) ) # Prints (4, 2)

#### 3.2. Increment and decrement

- Increment
`(+=x)`

adds`x`

to the operand. - Decrement
`(-=x)`

subtracts`x`

to the operand.

x = 10 y = 10 x += 1 print (x) # Prints 11 x += 5 print (x) # Prints 16 y -= 1 print (y) # Prints 9 y -= 5 print (y) # Prints 4

#### 3.3. Exponent

Exponential calculation is possible using `**`

operator.

x = 10 y = 2 print (x ** y) # Prints 100

## 4. isinstance to check type

If you want to verify if an integer belongs to the class int you can use `isinstance`

.

x = 10 print( isinstance(x, int) ) # Prints True

## 5. Convert Integer to String

Use string constructor `str()`

.

x = 10 valueOfX = str( x ) # '10'

## 6. Convert String to Integer

Use integer constructor `int()`

.

valueOfX = '10' x = int( valueOfX ) # 10

Happy Learning !!

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