Golang Basics: Feeling Go

package main

import (
	"fmt"
)

func main() {
	// Variable declaration with "var" keyword
	var name string
	var age int
	var height float64
	var name2 string = "Person"
	fmt.Printf("Varibles: name=%v, age=%v, height=%v, name2=%v \n", name, age, height, name2) // don't worry we'll cover use of fmt later in the series
	// reassigning values to variables declared with "var" keyword
	name2 = "Hugo"
	name = "Sarthak"
	age = 22
	height = 5.8
	fmt.Printf("Reassigned Varibles: name=%v, age=%v, height=%v, name2=%v \n", name, age, height, name2)
	// below redeclaration of "name" variable will cause error
	// var name string = "Human";

	// Variable declaration with "const" keyword
	const year int = 2021
	// below line will cause an error - reassigning of variable declaraed with const not allowed
	// year = 2022;

	// Variable declaration using the Short hand
	war := true
	country := "India"
	i := 3
	fmt.Printf("Short variable declaration: war=%v, country=%v, i=%v \n", war, country, i)

	// Types
	// Boolean
	var isGo bool = true
	fmt.Printf("Boolean: isGo={val:%v, type:%T}\n", isGo, isGo)
	// Numeric
	var j int8 = 32
	var k uint = 12 // unsigned int, means only positive values allowed, range 0 to 255
	var temperature float32 = 43.8
	fmt.Printf("Numeric: j={val:%v, type:%T}\nk={val:%v, type:%T}\ntemperature={val:%v, type:%T}\n", j, j, k, k, temperature, temperature)
	// Strings
	var text string = "Hello gophers" // strings are immutable, once created cannot be changed
	fmt.Printf("String: text={val:%v, type:%T}\n", text, text)
	// custom type
	type msg string
	var m msg = "Yo Yo Golang"
	fmt.Printf("String: msg={val:%v, type:%T}\n", m, m)

	// Type convertion
	var t int64 = 12345
	fmt.Printf("int: t={val:%v, type:%T}\n", t, t)
	var tf float64 = float64(t)
	fmt.Printf("Converted float: msg={val:%v, type:%T}\n", tf, tf)
}