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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