Go language data type conversion guide: from beginner to expert

Go language data type conversion tutorial: from beginner to advanced, specific code examples are required

Introduction:
In Go language programming, data type conversion is a important operation. It allows us to convert between different data types in order to correctly handle and manipulate the data in the program. This tutorial will gradually introduce data type conversion in Go language from beginner to advanced, while providing detailed code examples.

1. Conversion between basic data types
In the Go language, conversion between basic data types is the most common data type conversion. The following are examples of conversions between common basic data types:

1.1 Conversion between integer types
In actual development, we often need to convert between different integer data types. The following are examples of conversions between several common integer types:

// Convert int type to int64 type
var a int = 10
var b int64 = int64(a)

// Convert int64 type to int type
var c int64 = 20
var d int = int(c)

1.2 Conversion between floating point types
In When dealing with floating point data, it is sometimes necessary to convert floating point numbers of different types. The following are examples of conversions between several common floating point types:

// Convert float32 type to float64 type
var f1 float32 = 3.14
var f2 float64 = float64(f1)

// Convert float64 type to float32 type
var f3 float64 = 3.14
var f4 float32 = float32(f3)

1.3 Conversion between string and integer type
In the Go language, conversion between strings and integers is one of the common operations. The following are several common conversion examples between strings and integers:

//Convert strings to integers
var str1 string = "10"
var num1 int
num1, _ = strconv.Atoi(str1)

// Convert integer to string
var num2 int = 20
var str2 string
str2 = strconv.Itoa(num2 )

2. Conversion between complex data types
In addition to conversion between basic data types, conversion between complex data types is also required. The following are examples of conversions between several common complex data types:

2.1 Conversion between arrays and slices
In the Go language, arrays and slices are two common data structures. Conversion between is one of the common operations. The following are several common examples of conversion between arrays and slices:

//Convert array to slice
var arr = [3]int{1, 2, 3}
var slice = arr[:]

//Convert slice to array
var slice = []int{1, 2, 3}
var arr [3]int
copy(arr[ :], slice)

2.2 Conversion between structure and JSON
In Go language, conversion between structure and JSON is a very common operation. The following are several common conversion examples between structures and JSON:

//Convert structure to JSON
type Person struct {

Name string `json:"name"`
Age  int    `json:"age"`

}
var person = Person{Name: "Tom", Age: 18}
var jsonBytes, _ = json.Marshal(person)

// Convert JSON to structure
var person Person
json.Unmarshal(jsonBytes, &person)

3. Type assertion and type conversion
In the Go language, type assertion and type conversion are very useful operations. The following are several common examples of type assertions and type conversions:

3.1 Type Assertion
In the Go language, you can use type assertions to convert an empty interface (interface{}) into a specific type. The following are several common type assertion examples:

// Convert the empty interface (interface{}) to the string type
var val interface{} = "Hello"
var strVal string
strVal = val.(string)

3.2 Type conversion
In the Go language, you can use type conversion to convert a specific type to another specific type. The following are several common type conversion examples:

//Convert integer to floating point type
var num int = 10
var floatNum float64
floatNum = float64(num)

// Convert floating point type to integer type
var floatNum float64 = 3.14
var num int
num = int(floatNum)

Conclusion:
This The tutorial gradually introduces data type conversion in Go language from beginner to advanced, including conversion between basic data types, conversion between complex data types, and type assertion and type conversion. Through actual code examples, it helps readers understand and master data type conversion skills in Go language. For beginners, you can start with conversion between basic data types and gradually learn and practice. For advanced developers, you can have an in-depth understanding of and flexibly apply advanced techniques such as type assertions and type conversions to improve code readability and flexibility.

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