A function represents a block of statements which performs a specific task. A function declaration tells us function name, return type and input parameters. Function definition represents the code contained in the function. The syntax for declaring the function is
func function_name(parameter_1 type, parameter_n type) return_type {
//statements
}
The parameters and return types are optional. Also, you can return multiple values from a function.
Now in this Golang tutorial, let’s run the following Golang example. Here function named calc will accept 2 numbers and performs the addition and subtraction and returns both values.
package main
import "fmt"
//calc is the function name which accepts two integers num1 and num2
//(int, int) says that the function returns two values, both of integer type.
func calc(num1 int, num2 int)(int, int) {
sum := num1 + num2
diff := num1 - num2
return sum, diff
}
func main() {
x,y := 15,10
//calls the function calc with x and y an d gets sum, diff as output
sum, diff := calc(x,y)
fmt.Println("Sum",sum)
fmt.Println("Diff",diff)
}
The output will be
Sum 25
Diff 5
