int16 is a 16-bit signed integer with a range from -32,768 to 32,767. If you try to add 1 to 32,767 (the maximum value for int16), it will overflow, wrapping around to the minimum value, -32,768, due to how binary arithmetic works in fixed-size integers. This is called integer overflow.

var x int16 = 32767
x = x + 1 // x becomes -32768

• int32: A 32-bit signed integer with a range from -2,147,483,648 to 2,147,483,647.
• int64: A 64-bit signed integer with a range from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807.
• uint16: A 16-bit unsigned integer with a range from 0 to 65,535.
• float32: A 32-bit floating-point number with a range of approximately ±1.18e-38 to ±3.4e38 and a precision of about 6-7 decimal digits.

You can initialize two variables in the same line with the following:

var1, var2 := 1, 2

• := is Go's short variable declaration operator. It declares a new variable and initializes it in one step.

  age := 21          // int
  price := 19.99     // float64
  isAdmin := false   // bool
  

• You can also declare multiple variables:

  name, age := "Hamada", 21
  
  // Equivalent to:
  var name string = "Hamada"
  var age int = 21
  

• You cannot use := again unless at least one variable on the left side is new.

• Take note its not allowed at package level.