Understanding Data Types in Go

1. Bool
2. Numerical
3. String

1. This program shows some of the different data types in Go
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   package main

   import "fmt"

   func main() {

   var a bool = true // Boolean

   var b int = 5 // Integer

   var c float32 = 6.14 // Floating point number

   var d string = "PRWATECH!" // String

   fmt.Println("Boolean: ", a)

   fmt.Println("Integer: ", b)

   fmt.Println("Float: ", c)

   fmt.Println("String: ", d)

   }

   package main import "fmt" func main() { var a bool = true // Boolean var b int = 5 // Integer var c float32 = 6.14 // Floating point number var d string = "PRWATECH!" // String fmt.Println("Boolean: ", a) fmt.Println("Integer: ", b) fmt.Println("Float: ", c) fmt.Println("String: ", d) }

   package main
   import "fmt"
   
   func main() {
   	var a bool = true          // Boolean
   	var b int = 5              // Integer
   	var c float32 = 6.14       // Floating point number
   	var d string = "PRWATECH!" // String
   
   	fmt.Println("Boolean: ", a)
   	fmt.Println("Integer: ", b)
   	fmt.Println("Float:   ", c)
   	fmt.Println("String:  ", d)
   }	
   

   Output :
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   PS C:\GO_Language\datatype> go run type.go

   Boolean: true

   Integer: 5

   Float: 6.14

   String: PRWATECH!

   PS C:\GO_Language\datatype> go run type.go Boolean: true Integer: 5 Float: 6.14 String: PRWATECH!

   PS C:\GO_Language\datatype> go run type.go
   Boolean:  true
   Integer:  5
   Float:    6.14
   String:   PRWATECH!
   

2. Boolean data type: datatype is declared with the bool keyword and can take the values true or false.
   1. This program shows some different ways to declare Boolean variables:
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      package main

      import "fmt"

      func main() {

      var b1 bool = true

      var b2 = true

      var b3 bool

      b4 := true

      fmt.Println(b1)

      fmt.Println(b2)

      fmt.Println(b3)

      fmt.Println(b4)

      }

      package main import "fmt" func main() { var b1 bool = true var b2 = true var b3 bool b4 := true fmt.Println(b1) fmt.Println(b2) fmt.Println(b3) fmt.Println(b4) }

      package main
      import "fmt"
      func main() {
          var b1 bool = true
          var b2 = true
          var b3 bool
          b4 := true
          fmt.Println(b1)
          fmt.Println(b2)
          fmt.Println(b3)
          fmt.Println(b4)
      }
      

      Output :
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      PS C:\GO_Language\datatype> go run bool.go

      true

      true

      false

      true

      PS C:\GO_Language\datatype> go run bool.go true true false true

      PS C:\GO_Language\datatype> go run bool.go
      true
      true
      false
      true
      

• • • Integer data type: are used to store a whole no. without decimals, like 35.50.

• • • Integer has two types:
      1. Signed integers
      2. Unsigned integers
       
      • Singed integer:
      Signed integers, declared with one of the int keywords, can store both positive and negative values
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      package main

      import "fmt"

      func main() {

      var x int = 50

      var y int = 40

      fmt.Printf("Type: %T, value: %v \n", x, x)

      fmt.Printf("Type: %T, value: %v", y, y)

      }

      package main import "fmt" func main() { var x int = 50 var y int = 40 fmt.Printf("Type: %T, value: %v \n", x, x) fmt.Printf("Type: %T, value: %v", y, y) }

      package main
      
      import "fmt"
      
      func main() {
          var x int = 50
          var y int = 40
          fmt.Printf("Type: %T, value: %v \n", x, x)
          fmt.Printf("Type: %T, value: %v", y, y)
      }
      

      Output :
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      PS C:\GO_Language\datatype> go run int1.go

      Type: int, value: 50

      Type: int, value: 40

      PS C:\GO_Language\datatype> go run int1.go Type: int, value: 50 Type: int, value: 40

      PS C:\GO_Language\datatype> go run int1.go
      Type: int, value: 50 
      Type: int, value: 40
      

•          Unsigned integers:

package main
import "fmt"

func main() {
    var x uint = 50
    var y uint = 450

    fmt.Printf("Type: %T, value: %v \n", x, x)
    fmt.Printf("Type: %T, value: %v", y, y)
}

PS C:\GO_Language\datatype> go run int2.go
  
Type: uint, value: 50 
Type: uint, value: 450

package main

import "fmt"

func main() {
    var x float32 = 23.78
    var y float32 = 3.4e+38

    fmt.Printf("Type: %T, value: %v\n", x, x)
    fmt.Printf("Type: %T, value: %v", y, y)
}

PS C:\GO_Language\datatype> go run float1.go
  
Type: float32, value: 23.78
Type: float32, value: 3.4e+38

package main
import "fmt"

func main() {
    var x float64 = 1.7e+308
    
    fmt.Printf("Type: %T, value: %v", x, x)
    
}

PS C:\GO_Language\datatype> go run float2.go
   
Type: float64, value: 1.7e+308

package main

import "fmt"

func main() {
    var txt1 string = "parwatech"
    var txt2 string
    txt3 := "World 1"

    fmt.Printf("Type: %T, value: %\n", txt1, txt1)
    fmt.Printf("Type: %T, value: %v\n", txt2, txt2)
    fmt.Printf("Type: %T, value: %v\n", txt3, txt3)
}

PS C:\GO_Language\datatype> go run str.go   
 
Type: string, value: parwatech 
Type: string, value:  
Type: string, value: World 1