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Learn Go: fmt Package
Getting User Input

Another helpful method from the fmt package is .Scan() which allows us to get user input! Let’s see an example of this in action:

fmt.Println("How are you doing?") var response string fmt.Scan(&response) fmt.Printf("I'm %v.", response)

We’ll go through this line by line: First, we print How are you doing? to the terminal. Then we declare a variable, response with the type string. fmt.Scan(&response) takes the first value before a space and stores it in response. In the terminal, we would see:

How are you doing?

If we type in good and press enter, we would see:

How are you doing? good I'm good.

However, if we tried to type in not bad:

How are you doing? not bad I'm not.

Only the not part is saved, since it was separated from bad by a space. If we were expecting two values, we’d need to declare two variables ahead of time:

fmt.Println("How are you doing?") var response1 string var response2 string fmt.Scan(&response1) fmt.Scan(&response2) fmt.Printf("I'm %v %v", response1, response2)

fmt.Scan() expects addresses for arguments, hence the & before response1 and response2. We’ll cover more about addresses in a later lesson. For now, let’s get comfortable with the syntax.

Instructions

1.

Under the first print statement, declare a string variable named food.

2.

Call fmt.Scan() with the argument &food.

3.

Uncomment the last print statement and run the program in the terminal by entering the command go run main.go.

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