Notice: This page requires JavaScript to function properly.
Please enable JavaScript in your browser settings or update your browser.
Lära Floating-Point Numbers | Data Types
Introduction to GoLang

book
Floating-Point Numbers

If we try to store a decimal number in an integer variable, it will give us an error:

index.go

index.go

copy
var myVariable int
myVariable = 7.9 // Error in this line
12
var myVariable int myVariable = 7.9 // Error in this line

To store decimal values, a different data type is needed. In programming languages, including Go, we use floating-point numbers, often referred to as floats, to represent decimal numbers.

In Go, floating-point numbers come in two types: float32 and float64. float32 is a 32-bit type with limited precision, suitable for a broad range of decimal values when memory efficiency is crucial. Conversely, float64 is a 64-bit type referred to as "double precision" and provides greater accuracy, making it the default choice for most calculations requiring precision.

index.go

index.go

copy
package main
import "fmt"

func main() {
var myFloatValue1 float32 = 3.1415926535
var myFloatValue2 float64 = 3.1415926535
fmt.Println("float32:", myFloatValue1)
fmt.Println("float64:", myFloatValue2)
}
12345678910
package main import "fmt" func main() { var myFloatValue1 float32 = 3.1415926535 var myFloatValue2 float64 = 3.1415926535 fmt.Println("float32:", myFloatValue1) fmt.Println("float64:", myFloatValue2) }

In the output of the program above, you can observe that the myFloatValue1 variable, which is of type float32, retains up to 7 decimal points. It's worth noting that the last digit is rounded to 7, resulting in an output of 3.1415927 instead of the original 3.1415926535.

Conversely, myFloatValue2 outputs the complete high-precision value 3.1415926535.

question mark

What will be the output of the code?

package main
import "fmt"

func main() {
const value float32 = 1.23456789
fmt.Println(value)
}

Select the correct answer

Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

Avsnitt 2. Kapitel 2

Fråga AI

expand

Fråga AI

ChatGPT

Fråga vad du vill eller prova någon av de föreslagna frågorna för att starta vårt samtal

We use cookies to make your experience better!
some-alt