How to convert string to floating point number in go language

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.

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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