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This article introduces the knowledge of "how to convert a string into a floating point number in go". Many people will encounter this dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Go language method for converting strings to floating-point numbers: using the ParseFloat () function

The ParseFloat () function is used to convert a string representing a floating point number to a float type, signed as follows.

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

Parameter description:

If s conforms to the grammatical rules, the function returns a floating-point number closest to the value represented by s (rounded using the IEEE754 specification).

BitSize specifies the type of return value. 32 means float32,64 means float64.

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

The sample code is as follows:

Package mainimport ("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 results are as follows:

3.1415926

Description:

The function all has two return values, the first of which is the converted value, and the second is the error message that the conversion failed.

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