In-depth understanding of formal parameters in golang

In Golang, formal parameter requirements are considered very strict. Using the wrong type or number of formal parameters in a function can cause compiler errors or runtime errors. This article will introduce the type and quantity requirements of Golang formal parameters, and how to use them correctly.

1. Type requirements of function parameters

In Golang, the type of function parameters is very important. Ensuring that you use the correct types is key to ensuring that your code is correct and readable. The following are the data types of Golang function parameters:

• Boolean type: bool
• Integer type: int, int8, int16, int32, int64, uintptr, etc.
• Float Point type: float32, float64
• Complex number type: complex64, complex128
• String type: string
• Slice type: []T
• Type pointer: *T
• Structure type: struct
• Interface type: interface
• Function type: func
• Channel type: chan T, chan<- T and <-chan T

Example:

func add(x int, y int) int {

return x + y

}

above In the example, the parameters x and y are both defined as int type, which means we can only pass integer values ​​to them.

2. Number of function parameters requirements

In Golang, the number of function parameters is also very important. Golang has no concept of default parameters or optional parameters. All parameters must be explicitly defined in the function. If you want to skip one or more parameters, you can use the corresponding zero value or a pointer to a zero value of its type.

Here are some key points:

• If a function has one or more parameters, they must be specified in the function definition.
• Some functions may require zero or more parameters. In this case, you can use no parameters or use a parameter list with a variable number.
• It is not allowed to define overloaded functions, that is, functions with the same function name but different parameters.

Example:

func add_numbers(nums ...int) int {

result := 0
for _, num := range nums {
    result += num
}
return result

}

In the above example, we use The variable number parameter list of "...int" allows us to pass any number of int type parameters without specifying their number in the function definition.

Summary

The type and number of function parameters is one of the key concepts in Golang programming. When writing functions, make sure you use data types correctly and consider the number of parameters you need. If you need to define a function with multiple parameters, you must specify them in the function definition and you cannot use overloaded functions.

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