Unit 0 Getting started
lesson 1 get ready, get set, go
- With the Go Playground you can start using Go without installing anything.
- Every Go program is made up of functions contained in packages.
- To print text on the screen, use the fmt package provided by the standard library.
- Punctuation is just as important in programming languages as it is in natural languages.
- You used 3 of the 25 Go keywords:
package,import, andfunc
break default func interface select
case defer go map struct
chan else goto package switch
const fallthrough if range type
continue for import return var
Unit 1 Imperative programming
Travel to Mars.
lesson 2 a glorified calculator
package main
import "fmt"
func main() {
fmt.Print("My weight on the surface of Mars is ")
fmt.Print(149.0 * 0.3783) // always 37.83%
fmt.Print(" lbs, and I would be ")
fmt.Print(41 * 365 / 687)
fmt.Print(" years old.")
fmt.Println()
fmt.Println("My weight on the surface of Mars is", 70*0.3783, " KG, and I would be ", 36*365/687, " years old.")
// %v for the value of the expression. https://golang.org/pkg/fmt/
fmt.Printf("My weight on the surface of Mars is %v KG, and I would be %v years old.\n", 70*0.3783, 36*365/687)
//align text.
// positive value pads with spaces to the left,
// negtive number pads with spaces to the right.
fmt.Printf("%-15v $%4v\n", "SpaceX", 94)
fmt.Printf("%-15v $%4v\n", "Virgin Galactic", 100)
const lightSpeed = 299792 // km/s
var distance = 56000000 //km
fmt.Println(distance/lightSpeed, " seconds")
distance = 401000000
fmt.Println(distance/lightSpeed, " seconds")
}
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