Tutorial

A variable is a name given to a storage area that the programs can manipulate. The name of a variable can be composed of letters, digits, and the underscore character. It must begin with either a letter or an underscore.

Numbers

They are arithmetic types and they represents following values throughout the program. a) integer types b) floating point

To define an integer, use the following syntax:

var a int = 4
var b, c int
b = 5
c = 10
fmt.Println(a)
fmt.Println(b + c)

To define a floating point number, you may use one of the following notations:

var d float64 = 9.14
fmt.Println(d)

Strings

Strings in Go are defined with double quotes.

var s string = "This is string s"
fmt.Println(s)

The difference between the two is that using double quotes makes it easy to include apostrophes (whereas these would terminate the string if using single quotes)

var s string = "Don't worry about apostrophes"
fmt.Println(s)

Shorthand Declaration

The := notation serves both as a declaration and as initialization. foo := "bar" is equivalent to var foo string = "bar"

a := 9
b := "golang"
c := 4.17
d := false
e := "Hello"
f := `Do you like golang, so far?`
g := 'M'

fmt.Println(a)
fmt.Println(b)
fmt.Println(c)
fmt.Println(d)
fmt.Println(e)
fmt.Println(f)
fmt.Println(g)

Exercise

You must print out to the console the following:

John Doe
24
154.61

Tutorial Code

package main
import "fmt"
func main() {
    name := "Chris Mien"
    age := 29
    weight := 200.21
    fmt.Println(name)
    fmt.Println(age)
    fmt.Println(weight)
}

Expected Output

John Doe
24
154.61

Show Solution

package main
import "fmt"
func main() {
    name := "John Doe"
    age := 24
    weight := 154.61
    fmt.Println(name)
    fmt.Println(age)
    fmt.Println(weight)
}