drc288 / learn_go

Golang

Is an open source programming language that makes it easy to build simple, reliable,and efficient software.

The purpose of this repository is to be able to understand and perform different golang exercises, so I can perform in different languages.

For this I use the Holberton methodology, which has helped me to understand low and high level languages.

Data types

Signed Integers

Type	Size	Range
int8	8 bits	-128 to 127
int16	16 bits	-2^15 to 2^15 -1
int32	32 bits	-2^31 to 2^31 -1
int64	64 bits	-2^63 to 2^63 -1
int	Plataform dependent	Plataform dependent

The size of the generic int type is platform dependent. It is 32 bits wide on a 32-bit system and 64-bits wide on a 64-bit system.

Unsigned Integers

Type	Size	Range
uint8	8 bits	0 to 127
uint16	16 bits	0 to 2^16 -1
uint32	32 bits	0 to 2^32 -1
uint64	64 bits	0 to 2^64 -1
uint	Plataform dependent	Plataform dependent

Integer Type aliases

Type	Alias For
byte	uint8
rune	int32

for example:

package main
import "fmt"

func main() {
	var myByte byte = 'a'
	var myRune rune = '♥'

	fmt.Printf("%c = %d and %c = %U\n", myByte, myByte, myRune, myRune)
}

Output

a = 97 and ♥ = U+2665

Floating Point Types

Floating point types are used to store numbers with a decimal component (ex - 1.24, 4.50000). Go has two floating point types - float32 and float64.

• float32 occupies 32 bits in memory and stores values in single-precision floating point format
• float64 occupies 64 bits in memory and stores values in double-precision floating point format

Operations on Numeric Types

Go provides several operators for performing operations on numeric types

• Arithmetic Operators: +, -, *, /, %
• Comparation Operators: ==, !=, <, >, <=, >=
• Bitwise Operators: &, |, ^, <<, >>
• Increment and Decrement Operators: ++, --
• Assignment Operators: +=, -=, *=, /=, %=, <<=, >>=, &=, |=, ^=