if, else if, else

Learn conditional branching with if, else if and else in Go.

if, else if, else

In Go, an if condition needs no parentheses but the curly braces are required. The condition must be a bool; a number can't be used directly as a condition.

not := 72
if not >= 85 {
    fmt.Println("pekiyi")
} else if not >= 60 {
    fmt.Println("geçti")
} else {
    fmt.Println("kaldı")
}

else must be on the same line as the closing brace.

if with a short statement

if can take a short statement before the condition; a variable declared there exists only within the if-else block. It is used a lot for error checking:

if n, err := strconv.Atoi("42"); err != nil {
    fmt.Println("hata:", err)
} else {
    fmt.Println(n * 2)  // 84
}
// n isn't defined here

Exercise Grade evaluation

Write degerlendir(not int) string: 85 and above "pekiyi", 60 and above "geçti", otherwise "kaldı". Print degerlendir(90), degerlendir(72) and degerlendir(45) on one line.

Show example solution

package main

import "fmt"

func degerlendir(not int) string {
    if not >= 85 {
        return "pekiyi"
    } else if not >= 60 {
        return "geçti"
    }
    return "kaldı"
}

func main() {
    fmt.Println(degerlendir(90), degerlendir(72), degerlendir(45))
}

Test yourself

Why doesn't <code>if n { ... }</code> (n an int) compile?
- It compiles
- The condition must be a bool; write n != 0
- Parentheses are missing
- An int can't be used inside an if
Show answer

The condition must be a bool; write n != 0 — Go doesn't automatically convert numbers or nil to bool; the comparison is written explicitly.

Middle condition

if not >= 85 {
    fmt.Println("pekiyi")
} ____ not >= 60 {
    fmt.Println("geçti")
}

Show answer

if not >= 85 {
    fmt.Println("pekiyi")
} else if not >= 60 {
    fmt.Println("geçti")
}

Grade and result

90

pekiyi
72

geçti
45

kaldı
else

When none is true

Next lesson: for loop

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