int and float

Learn integer and floating-point types.

int and float

In Go, int is used for whole numbers and float64 for decimals. int is 32 or 64 bits depending on the platform; on today's computers it is 64 bits.

yas := 36          // int
boy := 1.72        // float64
fmt.Println(yas, boy)

When a specific size is needed there are also int8, int16, int32, int64 and the unsigned uint types.

Integer and decimal operations

With integers, % gives the remainder: 7 % 2 → 1. With decimals, division gives the real result: 7.0 / 2 → 3.5. Because decimals are stored in binary, 0.1 + 0.2 isn't exactly 0.3; for money it's safer to keep cents as an integer.

Exercise Division and remainder

Declare a := 17 and b := 5. Print a / b, a % b and float64(a) / float64(b) with one fmt.Println.

Show example solution

package main

import "fmt"

func main() {
    a := 17
    b := 5
    fmt.Println(a/b, a%b, float64(a)/float64(b))
}

Test yourself

What does <code>7 / 2</code> give in Go?
- 3
- 3.5
- 4
- An error
Show answer

3 — Dividing two ints gives an int and the fraction is dropped. For 3.5, write 7.0 / 2.

Find the remainder

kalan := 17 ____ 5  // 2

Show answer

kalan := 17 % 5  // 2

Value and type

42

int
3.14

float64
7 / 2

3 (int)
7.0 / 2

3.5 (float64)

Next lesson: bool and string

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