int and float
- Go course
- Beginner
- Lesson 19/90
- 4 min
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.
Practice Division and remainder
Declare a := 17 and b := 5. Print a / b, a % b and float64(a) / float64(b) with one fmt.Println.
Starter code
package main
import "fmt"
func main() {
// buraya yaz
}Sample solution
package main
import "fmt"
func main() {
a := 17
b := 5
fmt.Println(a/b, a%b, float64(a)/float64(b))
}Expected output
3 2 3.4
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 What does <code>7 / 2</code> give in Go?
- 3 Correct answer
- 3.5
- 4
- An error
Explanation: Dividing two ints gives an int and the fraction is dropped. For 3.5, write 7.0 / 2.
2 Find the remainder
kalan := 17 ____ 5 // 2kalan := 17 % 5 // 2Explanation: The % operator gives the remainder of integer division.
3 Value and type
| Term | Meaning |
|---|---|
42 |
int |
3.14 |
float64 |
7 / 2 |
3 (int) |
7.0 / 2 |
3.5 (float64) |