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### Go Data Type

• date 17th August, 2022 |
• by Prwatech |

## Understanding Data Types in Go

Go has three basic data types:

1. Bool
2. Numerical
3. String

1. This program shows some of the different data types in Go
```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 :

```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:
```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 :

```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

```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 :

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

Unsigned integers, declared with one of the uint keywords, can only store non-negative values:

```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)
}

```

Output :

```PS C:\GO_Language\datatype> go run int2.go

Type: uint, value: 50
Type: uint, value: 450
```

3)float data type:

are used to store positive and negative no. which a decimal point, like 35.3, -32, to 3423.243525.

Type                           size                              Range

Float32                        32bits                          -34e+38 to 3.4e+38.

Float64                        64bits                          -1.7e+308 to 3.4e+308.

This program shows how to declare some variables of type float32:

```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)
}
```

output :

```PS C:\GO_Language\datatype> go run float1.go

Type: float32, value: 23.78
Type: float32, value: 3.4e+38
```

This Progeam shows how to declare a variable of type float64:

```package main
import "fmt"

func main() {
var x float64 = 1.7e+308

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

}
```

check output :

```PS C:\GO_Language\datatype> go run float2.go

Type: float64, value: 1.7e+308
```

3)String Data type: the string datatype is use to store a sequence of characters. String values must be surround by double quotes:

```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)
}
```

output:

```PS C:\GO_Language\datatype> go run str.go

Type: string, value: parwatech
Type: string, value:
Type: string, value: World 1
```

Understanding Data Types in Go

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