Data Types in Go

Data types specify the type of data that a valid Go variable can hold. In Go language, the type is divided into four categories which are as follows:

1. Basic type: Numbers, strings, and booleans come under this category.
2. Aggregate type: Array and structs come under this category.
3. Reference type: Pointers, slices, maps, functions, and channels come under this category.
4. Interface type

Here, we will discuss Basic Data Types in the Go language. The Basic Data Types are further categorized into three subcategories which are:

• Numbers
• Booleans
• Strings

Numbers

In Go language, numbers are divided into three sub-categories that are:

• Integers: In Go language, both signed and unsigned integers are available in four different sizes as shown in the below table. The signed int is represented by int and unsigned integer is represented by uint.
  

  Data Type	Description
  int8	8-bit signed integer
  int16	16-bit signed integer
  int32	32-bit signed integer
  int64	64-bit signed integer
  uint8	8-bit unsigned integer
  uint16	16-bit unsigned integer
  uint32	32-bit unsigned integer
  uint64	64-bit unsigned integer
  int	Both in and uint contain same size, either 32 or 64 bit.
  uint	Both in and uint contain same size, either 32 or 64 bit.
  rune	It is a synonym of int32 and also represent Unicode code points.
  byte	It is a synonym of int8 .
  uintptr	It is an unsigned integer type. Its width is not defined, but its can hold all the bits of a pointer value.

  Example:

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  // Go program to illustrate // the use of integers package main  import "fmt"           func main() {            // Using 8-bit unsigned int      var X uint8 = 225     fmt.Println(X+1, X)            // Using 16-bit signed int      var Y int16 = 32767     fmt.Println(Y+2, Y-2)  }

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  Output:

  226 225
  -32767 32765
  

• Floating-Point Numbers: In Go language, floating-point numbers are divided into two categories as shown in the below table:
  

  Data Type	Description
  float32	32-bit IEEE 754 floating-point number
  float64	64-bit IEEE 754 floating-point number

  Example:

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  // Go program to illustrate // the use of floating-point // numbers package main  import "fmt"           func main() {     a := 20.45     b := 34.89            // Subtraction of two      // floating-point number     c := b-a            // Display the result      fmt.Printf("Result is: %f", c)            // Display the type of c variable     fmt.Printf("\nThe type of c is : %T", c)   }

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  Output:

  Result is: 14.440000
  The type of c is : float64
  

• Complex Numbers: The complex numbers are divided into two parts are shown in the below table. float32 and float64 are also the part of these complex numbers. The in-built function creates the complex number from its imaginary and real part and in-built imaginary and real function extract those parts.
  

  Data Type	Description
  complex64	Complex numbers which contain float32 as a real and imaginary component.
  complex128	Complex numbers which contain float64 as a real and imaginary component.

  Example:

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  // Go program to illustrate // the use of complex numbers package main import "fmt"    func main() {           var a complex128 = complex(6, 2)    var b complex64 = complex(9, 2)    fmt.Println(a)    fmt.Println(b)          // Display the type    fmt.Printf("The type of a is %T and "+             "the type of b is %T", a, b) }

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  Output:

  (6+2i)
  (9+2i)
  The type of a is complex128 and the type of b is complex64
  

Booleans

The boolean data type represents only one bit of information either true or false. The values of type boolean are not converted implicitly or explicitly to any other type.

Example:

Output:

false
true
The type of result1 is bool and the type of result2 is bool

Strings

String data type represents a sequence of Unicode code points. Or in other words, we can say a string is a sequence of immutable bytes, means once a string is created you cannot change that string. A string may contain arbitrary data, including bytes with zero value in the human-readable form.

Example:

Output:

Length of the string is:13
String is: GeeksforGeeks
Type of str is: string

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