Summary - Variables

Combine var, :=, const and zero value to write a profile.

Summary - Variables

In this section you learned variable declaration:

Explicit declaration and type annotation with var
Short declaration with := (function scope only)
Constants with const and auto-increment with iota
Every type has a zero value (0 for int, empty string for string)
Go infers the type from the right-hand side

Now you will combine these concepts to write a profile card. The goal: pick the right declaration form and start safely from the zero value.

Exercise Constant and variable

Define the constant const KDV = 0.20 and the variable fiyat := 150.0. Compute the price with VAT using toplam := fiyat * (1 + KDV) and print it.

Show example solution

package main

import "fmt"

const KDV = 0.20

func main() {
    fiyat := 150.0
    toplam := fiyat * (1 + KDV)
    fmt.Println(toplam)
}

Exercise Multiple assignment

Declare two variables with a, b := 3, 7. Swap them in one line (a, b = b, a) and print fmt.Println(a, b).

Show example solution

package main

import "fmt"

func main() {
    a, b := 3, 7
    a, b = b, a
    fmt.Println(a, b)
}

Test yourself

Short declaration operator

To assign 5 to x with the short form:
x ____ 5

Show answer

To assign 5 to x with the short form:
x := 5

Match the section concepts

var

Explicit decl
:=

Short decl
const

Constant
iota

Auto-increment

Next lesson: int and float

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