declaration.go

package main

import "fmt"

/*
function definition in Go programming language consists of a function header and a function body. Here are all the parts of a function −

Func − It starts the declaration of a function.

Function Name − It is the actual name of the function. The function name and the parameter list together constitute the function signature.

Parameters − A parameter is like a placeholder. When a function is invoked, you pass a value to the parameter.
The parameter list refers to the type, order, and number of the parameters of a function. Parameters are optional; that is, a function may contain no parameters.

Return Type − A function may return a list of values. The return_types is the list of data types of the values the function returns.
 Some functions perform the desired operations without returning a value. In this case, the return_type is the not required.

Function Body − It contains a collection of statements that define what the function does.
*/
func sum(a, b int) int {
	return a + b
}

func main() {
	x := 3
	y := 5

	//call sum function
	sum := sum(x, y)
	fmt.Println(sum)
}