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HomeBackend DevelopmentGolangHow to convert string to floating point number in go language

How to convert string to floating point number in go language

Jun 04, 2021 pm 04:42 PM
go languagestringfloating point number

In Go language, you can use the ParseFloat() function to convert a string into a floating point number type, the syntax is "strconv.ParseFloat(string, bitSize)"; the parameter bitSize specifies the type of return value, 32 means float32, 64 means float64.

How to convert string to floating point number in go language

The operating environment of this tutorial: Windows 10 system, GO 1.18, Dell G3 computer.

Go language method to convert a string into a floating point number: use the ParseFloat() function

The ParseFloat() function is used to convert a string representing a floating point number It is a float type and the function signature is as follows.

func ParseFloat(s string, bitSize int) (f float64, err error)

Parameter description:

  • If s is grammatical, the function will return a floating point number closest to the value represented by s (using IEEE754 specification rounding).

  • bitSize specifies the type of return value, 32 represents float32, 64 represents float64;

  • The return value err is of *NumErr type, if The syntax is incorrect err.Error=ErrSyntax. If the return value exceeds the representation range, the return value f is ±Inf, err.Error= ErrRange.

The sample code is as follows:

package main

import (
    "fmt"
    "strconv"
)

func main() {
    str := "3.1415926"
    num, err := strconv.ParseFloat(str, 64)
    if err != nil {
        fmt.Println(err)
    } else {
        fmt.Println(num)
    }
}

The running result is as follows:

3.1415926

Description:

  • This function There are two return values. The first return value is the converted value, and the second return value is the error message of the conversion failure.

Recommended learning: Golang tutorial

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