How to convert string to float in go language

The method of converting string to float in go language: 1. Create a go sample file; 2. Define a string; 3. Convert string to float through "v1, err:=strconv.ParseFloat(v, 32)" Just convert string to float.

Environment of this article: Windows 10 system, Go1.14 version, Dell G3 computer This article is applicable to all brands of computers.

Type conversion method between string, int, int64 and float in Go language

Both int type and string type in Go language are basic data types. Both types of conversions are very simple. This article will share with you the type conversion methods between string, int, int64 and float in Go language. Friends who are interested should take a look together

(1)int to string

s := strconv.Itoa(i)
等价于s := strconv.FormatInt(int64(i), 10)

(2 )int64 to string

i := int64(123)
s := strconv.FormatInt(i, 10)

The second parameter is the base number, optional 2~36

Note: For unsigned integer, you can use FormatUint(i uint64, base int)

(3)string to int

i, err := strconv.Atoi(s)

(4)string to int64

i, err := strconv.ParseInt(s, 10, 64)

The second parameter is the base (2~36), and the third parameter bit size indicates the expected conversion Result type, its value can be 0, 8, 16, 32 and 64, corresponding to int, int8, int16, int32 and int64 respectively

(5)float related

float to string:

v := 3.1415926535
s1 := strconv.FormatFloat(v, 'E', -1, 32)//float32s2 := strconv.FormatFloat(v, 'E', -1, 64)//float64

The function prototype and parameter meaning can be viewed for details: https://golang.org/pkg/strconv/#FormatFloat

String to float:

s := "3.1415926535"
v1, err := strconv.ParseFloat(v, 32)
v2, err := strconv.ParseFloat(v, 64)

PS: go language Convert string, int, int64 to each other

//string到int 
int,err:=strconv.Atoi(string) 
//string到int64 
int64, err := strconv.ParseInt(string, 10, 64) 
//int到string 
string:=strconv.Itoa(int) 
//int64到string 
string:=strconv.FormatInt(int64,10)
//string到float32(float64)
float,err := strconv.ParseFloat(string,32/64)
//float到string
string := strconv.FormatFloat(float32, 'E', -1, 32)
string := strconv.FormatFloat(float64, 'E', -1, 64)
// 'b' (-ddddp±ddd，二进制指数)
// 'e' (-d.dddde±dd，十进制指数)
// 'E' (-d.ddddE±dd，十进制指数)
// 'f' (-ddd.dddd，没有指数)
// 'g' ('e':大指数，'f':其它情况)
// 'G' ('E':大指数，'f':其它情况)

Recommended tutorial: "go language"

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