Welcome to the first tutorial. This tutorial will guide you through your first go program.
Golang is a modern statically typed and compiled language from Google.
In each golang program you need to define a package name at the top. So if you need to import your code into some other program you can use this package name to import. Execution of a golang project starts in the package "main". So let's define our package as main.
package main
Go follows a similar pattern as C and has a main function where the execution begins. In go functions are defined using func keyword.
This is an example main function
func main () {
}
Now to print something we need to use the Println function from the package "fmt"
To import a function you just write import following the package name in "".
import "somemodule"
Here is an example program to print "Hello World!"
package main
import "fmt"
func main () {
fmt.Println("This line is printed")
}
We dont need to add semi colons after each line in Go. The compiler takes care of it.
The fmt package also has a Printf() function similar to printf in C. It can be used in the same way as it is used in C.
fmt.Printf("%d is a number",10)
You must print out to the console the sentence "Hello, world!".
package main
import ( "fmt" )
func main() { fmt.Println("Goodbye, world!")
}
Hello, world!
package main
import ( "fmt" )
func main() { fmt.Println("Hello, world!")
}