Golang function declaration syntax

The declaration syntax of a Go function is func () { }. Among them, is the function name, is the parameter type and name, is the return value type and name, { } is the function execution code piece.

Go function declaration syntax

The function declaration syntax in Go language is as follows:

func <函数名>(<参数列表>) <返回值列表> {
    // 函数体
}

Where:

• <function name></function>: The name of the function.
• <parameter list></parameter>: The parameter list of the function, with parameter types and names separated by commas.
• <return value list></return>: The return value list of the function, the return value type and name are separated by commas.
• {}: Function body, containing the code for function execution.

Practical case: Calculate the mean of two numbers

func mean(a, b int) float64 {
    return float64(a+b) / 2
}

func main() {
    s1 := mean(2, 4)
    s2 := mean(5, 10)
    fmt.Println(s1) // 输出：3
    fmt.Println(s2) // 输出：7.5
}

In this example:

• mean The function calculates the mean of two integer parameters and returns a floating point number.

• main The function is the entry point of the program, where:

  • Call the mean function to calculate the mean of two numbers, And store the results in s1 and s2.
  • Output the values ​​of s1 and s2.

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