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Go Programming Language Functions
Go Programming Language Functions
Explains how to create function in Go programming.
Syntax:
func function_name return_data_type {
// task
return
}
here return_data_type and return code is optional.
Function with no parameters
package main
import "fmt"
func main() {
fmt.Println("main function - before show called")
show()
fmt.Println("main function - after show called")
}
func show() {
fmt.Println("Go user defined function 'show' is called")
}
Output:
$ go build function.go $ ./function main function - before show called Go user defined function 'show' is called main function - after show called
Function with Parameters
Go function can have one or more parameters.
Below code is used to create function with parameters.
package main
import "fmt"
func main() {
fmt.Println("main function - before show called")
msg := "testing"
show(msg)
fmt.Println("main function - after show called")
}
func show(msg string) {
fmt.Printf("Go user defined function 'show' is called: msg(%s)\n", msg)
}
Output:
$ go build function.go $ ./function main function - before show called Go user defined function 'show' is called: msg(testing) main function - after show called
Function with returning value
Function can also return one or more return values.
package main
import "fmt"
func main() {
var a,b,c int
a = 19
b = 5
c = add(a,b)
fmt.Printf("%d + %d: %d\n", a, b, c)
}
func add(a,b int) int {
return a+b
}
Output:
$ go build function.go $ ./function 19 + 5: 24« Previous Next »
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