golang data conversion

Golang is a modern and powerful programming language popular for its efficient processing capabilities and cross-platform support. Golang has many built-in data types, but in the actual development process, we often need to perform data type conversion in order to better operate data. This article will focus on data conversion in Golang.

1. Introduction

Data conversion in Golang refers to converting the value of one data type into the value of another data type. For example, convert a string to an integer. The data type conversions supported in Golang are as follows:

1. String type
2. Unsigned integer type
3. Signed integer type
4. Floating point type
5. Boolean type

2. Examples

The following are several examples showing how to perform data type conversion in Golang.

1. Convert string type to integer type

We need to convert a string type value to an integer type value, you can use the strconv.Atoi() function.

package main

import (
    "fmt"
    "strconv"
)

func main() {
    str := "123"
    num, _ := strconv.Atoi(str)
    fmt.Printf("str: %s, num: %d", str, num)
}

Output result:

str: 123, num: 123

2. Convert integer type to string type

We need to convert an integer type value to string type value, you can use the strconv.Itoa() function.

package main

import (
    "fmt"
    "strconv"
)

func main() {
    num := 123
    str := strconv.Itoa(num)
    fmt.Printf("num: %d, str: %s", num, str)
}

Output result:

num: 123, str: 123

3. Convert floating point type to integer type

We need to convert a value of floating point type to integer type value, you can use the int() function.

package main

import "fmt"

func main() {
    f := 3.1415926
    i := int(f)
    fmt.Printf("f: %f, i: %d", f, i)
}

Output result:

f: 3.141593, i: 3

4. Convert integer type to floating point type

We need to convert an integer type value to floating point type value, you can use the float64() function.

package main

import "fmt"

func main() {
    i := 3
    f := float64(i)
    fmt.Printf("i: %d, f: %f", i, f)
}

Output result:

i: 3, f: 3.000000

5. Convert Boolean type to string type

We need to convert a Boolean type value to string type value, you can use the strconv.FormatBool() function.

package main

import (
    "fmt"
    "strconv"
)

func main() {
    b := true
    str := strconv.FormatBool(b)
    fmt.Printf("b: %t, str: %s", b, str)
}

Output result:

b: true, str: true

3. Notes

In Golang, there are some things that need to be paid attention to when converting data types:

1. Type conversion must be explicit, that is, using a type conversion function.
2. Type conversion may cause data loss or change the precision of the data type. For example, when converting a floating point number to an integer type, the fractional part may be truncated.
3. When converting a string type value to an integer type value, the conversion function will return an error if the string cannot represent a valid integer. You can use the second return value to handle such errors.
4. When converting a floating-point value to an integer value, the floating-point number may be rounded or truncated.

4. Conclusion

In Golang, data type conversion is a very important operation. According to the requirements, we need to choose the appropriate function to perform type conversion, and at the same time, we should pay attention to some unpredictable results that the conversion will produce. I hope this article can help you with data type conversion in Golang development.

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