Type and meaning of golang function return value

Go functions can return values ​​of specified types, including basic types, composite types and reference types. The type and meaning of the return value are as follows: error type: indicates that the operation failed. Boolean: Indicates success or failure. Other types: Represents the results of operations.

Types and meanings of Go function return values

In the Go language, a function can return one or more values, and Each return value has its specific type. Understanding the type and meaning of return values ​​is critical to writing clear, reliable Go code.

Type of return value

The function can return any type of Go value, including basic types (such as int or string), composite types (such as struct or slice), and reference types (such as pointers or interfaces).

The meaning of the return value

In addition to the type, the return value also has a specific meaning. By convention, the return value has the following meaning: The

• error type is typically used to indicate operation failure.
• Boolean values ​​(bool) usually indicate success or failure.
• Other types of return values ​​represent the results of the operation.

Practical case

Let’s look at a function that calculates the sum of two numbers:

func SumAndDiff(a, b int) (int, int) {
    sum := a + b
    diff := a - b
    return sum, diff
}

This function returns two values: sum is of type int, which represents the sum of two numbers. diff is also of type int, which represents the difference of two numbers.

Using return values

When calling the SumAndDiff function, we can receive the return value by using multiple variables:

var s, d = SumAndDiff(10, 5)
fmt.Println("Sum:", s)
fmt.Println("Difference:", d)

This will print the following output:

Sum: 15
Difference: 5

Notes

• The function can return no value, in which case the return value type is void.
• If a function has multiple return values, they must be placed in order in the function declaration.
• The meaning of the return value type is conventional, and different functions may have different interpretations of the same type of return value.

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