# Go Programming

## 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 the unsigned integer is represented by uint.

Example:

 // 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, X-3)          // Using 16-bit signed int     var Y int16 = 32767     fmt.Println(Y+2, Y-2) }

Output:

225 222
-32767 32765
• Floating-Point Numbers: In Go language, floating-point numbers are divided into two categories as shown in the below table:

Example:

 // 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)  }

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 part of these complex numbers. The in-built function creates a complex number from its imaginary and real part and in-built imaginary and real function extract those parts.

Example:

 // 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) }

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:

 // Go program to illustrate // the use of booleans package main import "fmt" func main() {          // variables    str1 := "GeeksforGeeks"    str2:= "geeksForgeeks"    str3:= "GeeksforGeeks"    result1:= str1 == str2    result2:= str1 == str3        // Display the result    fmt.Println( result1)    fmt.Println( result2)        // Display the type of    // result1 and result2    fmt.Printf("The type of result1 is %T and "+                    "the type of result2 is %T",                              result1, result2)     }

Output:

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

#### Strings

The 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:

 // Go program to illustrate // the use of strings package main import "fmt" func main() {          // str variable which stores strings    str := "GeeksforGeeks"        // Display the length of the string    fmt.Printf("Length of the string is:%d",                                   len(str))        // Display the string    fmt.Printf("\nString is: %s", str)        // Display the type of str variable    fmt.Printf("\nType of str is: %T", str) }

Output:

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