[Summary sharing] Common type conversion methods in golang

Golang is a strongly typed programming language, so when processing data between different types, type conversion is required. This article will introduce common type conversion methods in Golang.

1. Number type conversion

In Golang, numeric type conversion is the most common type conversion. Common numeric types include int, float32, float64, etc. If you want to convert float type to int type, you can use the int() function. For example:

var x float32 = 1.23
var y int = int(x)

In this example, the value of variable y will be 1 because the decimal part of x is truncated. If you want to convert int type to float type, you can use float32() or float64() function. For example:

var x int = 10
var y float32 = float32(x)

In this example, the value of variable y will be 10.0. It should be noted that if a large float type is converted to an int type, precision may be lost. Therefore, careful consideration is needed when performing type conversion.

2. String type conversion

In Golang, string type conversion is often performed when reading external data sources (such as network protocols), Issues that must be dealt with when data storage (such as databases) and file operations are performed. Common string type conversions include converting strings to integer or floating point types, or converting strings to other complex data structures.

To convert a string to an integer or floating point number type, you can use the function in the strconv package. For example:

import "strconv"

var str = "123"
var num, err = strconv.Atoi(str)
// 如果发生错误，err不为空
var fnum, ferr = strconv.ParseFloat(str, 64)
// 如果发生错误，ferr不为空

In this example, the functions Atoi() and ParseFloat() both convert strings to numeric types. Among them, Atoi() converts the string to the int type, and ParseFloat() converts the string to the float64 type. Note that these functions will return an error if the string cannot be converted to a numeric type. Therefore, before using these functions, you need to check whether the error return value is empty.

3. Custom type conversion

In Golang, you can use the type keyword to define your own type. If you need to convert between these custom types, you can use the type conversion operator. () For example:

type Real int

var x Real = 10
var y int = int(x)

In this example, we define our own type Real. Then, we convert a variable x of type Real into a variable y of type int. It should be noted that this type conversion only converts the underlying value of the variable and does not perform any checking or conversion. If the converted value is not legal in another type, it may cause a program error.

In short, type conversion is a very important aspect of Golang programming and must be handled very carefully. This article introduces common type conversion methods such as numeric types, string types, and custom types, hoping to help readers better understand and use the Golang language.

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