golang explicit conversion

In Go language, explicit conversion (Type Conversion) is an operation to convert one data type to another data type. In some cases, data of different types like int and float must be explicitly converted before they can be manipulated. In this article, we will explore explicit conversions and their usage in Go language.

Declaring variables

Before we start discussing explicit conversions in Go language, we need to know how to declare variables. The variable declaration method in Go language is as follows:

var name type

where name is the variable name and type is the variable data type. For example, to declare an integer type variable named num, we can use the following code:

var num int

Type conversion

In Go language, any data type can be converted directly to another data type. There are two ways of type conversion: implicit conversion and explicit conversion.

Implicit conversion

In the Go language, when two variables of different data types are operated, Go will automatically convert one of the variables to another data type. This conversion It's called an implicit conversion. For example:

var num int = 10
var f float32 = 1.5
var result float32

result = f num // Implicit conversion
fmt.Println(result )

In the above code, since num and f are different data types, Go will convert num to float32 type and then perform the operation.

Explicit conversion

Explicit conversion is a more explicit way of type conversion used in programs, which allows us to convert the value of a variable from one type to another type. Explicit conversion can be done by using the conversion name and the data type that needs to be converted.

The syntax is as follows:

variable_name := (value)

For example, we can convert a string to an integer type:

str := "123"
i, _ := strconv.Atoi(str)
fmt.Println(i)

In the above code, we use the strconv.Atoi() function. Casting, converts string type to integer type.

Similarly, we can also convert an integer to a string type:

i := 123
str := strconv.Itoa(i)
fmt.Println( str)

In the above code, we use the strconv.Itoa() function to convert the integer type to the string type.

Notes

When performing type conversion, be sure to pay attention to the range of the data type. For example, if a value of an integer type is too large, overflow may occur even when converted to a larger value type.

In addition, when using explicit conversion, you also need to confirm whether the value of the variable can be converted to the target data type. If the data types are different, but certain implicit conversions are allowed between certain data types, unexpected behavior may occur.

Conclusion

In Go language, explicit conversion is an operation to convert one data type to another data type. This conversion can be done using the conversion name and the data type that needs to be converted. During the conversion process, you need to pay attention to the range of the data type and whether the value of the converted variable is acceptable.

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