Go: Primitive Data Types

Below table summarizes the data types provided by Go Language.

Integer Data Types

Data Type	Description	Minimum Value	Maximum Value
uint8	Unsigned 8-bit integers	0	255
uint16	Unsigned 16-bit integers	0	65535
uint32	Unsigned 32-bit integers	0	4294967295
uint64	Unsigned 64-bit integers	0	18446744073709551615
int8	Signed 8-bit integers	-128	127
int16	Signed 16-bit integers	-32768	32767
int32	Signed 32-bit integers	-2147483648	2147483647
int64	Signed 64-bit integers	-9223372036854775808	9223372036854775807

Below table summarizes floating point numbers.

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

Below table summarizes the complex numbers.

Data Type	Description
complex64	Complex numbers with float32 real and imaginary parts
complex128	Complex numbers with float64 real and imaginary parts

Apart from the above types, Go language support below types that are implementation specific.

a.   Byte

b.   rune (same as int32)

c.    uint

d.   int

e.   uintptr

Syntax to create variable

var variableName dataType

var variableName dataType  = value

variableName := value

HelloWorld.go

package main

import "fmt"

func main() {
 var a int = 10
 var b uint8 = 11
 var c uint16 = 12
 var d uint32 = 13
 var e uint64 = 14
 var f int8 = 15
 var g int16 = 16
 var h int32 = 17
 var i int64 = 18

 var k float32 = 2
 var l float64 = 2

 complex1 := complex(10, 13)

 fmt.Println("a : ", a);
 fmt.Println("b : ", b);
 fmt.Println("c : ", c);
 fmt.Println("d : ", d);
 fmt.Println("e : ", e);
 fmt.Println("f : ", f);
 fmt.Println("g : ", g);
 fmt.Println("h : ", h);
 fmt.Println("i : ", i);

 fmt.Println("k : ", k);
 fmt.Println("l : ", l);

 fmt.Println("complex1 : ", complex1);

}

Output

a :  10
b :  11
c :  12
d :  13
e :  14
f :  15
g :  16
h :  17
i :  18
k :  2
l :  2
complex1 :  (10+13i)

How to access real and imaginary numbers from complex numbers?

You can use ‘real’ and ‘img’ methods to access the real and complex parts of a number.

myComplex := complex(10, 13)

real(myComplex)

imag(myComplex)

HelloWorld.go

package main

import "fmt"

func main() {

 complex1 := complex(10, 13)
 var realPart = real(complex1)
 var imgPart = imag(complex1)

 fmt.Println("complex1 : ", complex1);
 fmt.Println("realPart : ", realPart);
 fmt.Println("imgPart : ", imgPart);

}

Output

complex1 :  (10+13i)
realPart :  10
imgPart :  13

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