Lernen Floating-Point Numbers

Swipe um das Menü anzuzeigen

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

index.go


              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


              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.

War alles klar?

Danke für Ihr Feedback!

Abschnitt 1. Kapitel 12

Fragen Sie AI

Fragen Sie alles oder probieren Sie eine der vorgeschlagenen Fragen, um unser Gespräch zu beginnen

Abschnitt 1. Kapitel 12