numbers.md

Numbers

Integers and Floats

• Ruby numbers has 2 categories: Intergers and Floats.
• Integers is numbers with no decimal points. Ex: 10, -5
• Floats is numbers with decimal points. Ex: 1.25, -3.144445

Examples:

# Integer
x = 10
x.class
=> Integer

# Float
x = 5.0
x.class
=> Float
 
x = 10.25
x.class
=> Float

Operaters

• Addition (+)

3 + 5   #=> 8
3 + 5.5 #=> 8.5

• Substraction (-)

5 - 3    #=> 2
3 - 5.5  #=> -2.5

• Multiplication (*)

3 * 5    #=> 15
3 * 5.5  #=> 16.5

• Division (/)

10/3    #=> 3
10/3.0  #=> 3.3333333333333335
10.0/3  #=> 3.3333333333333335

• To power (**)

2**3  #=> 8

• Modulo (%)

10 % 3  #=> 1
10 % 4  #=> 2

Convert numbers

• Convert to Float: Using to_f

x = 5
x.class
=> Integer
x = x.to_f
=> 5.0
x.class
=> Float

• Convert to Integer: Using to_i

x = 5.3
x.class
=> Float
x = x.to_i
=> 5
x.class
=> Integer

• Convert to String: Using to_s

500.to_s
=> "500"
10.22.to_s
=> "10.22"