Type a number

Running the Program

The first statement is an ordinary PRINT statement that writes a string to the monitor.

' Double a Number
'
PRINT "Type a number"     'Ask the user for a number
INPUT NUMBER              'Get it from the keyboard, put it in NUMBER
PRINT NUMBER * 2          'Print the number times two.
END

Now the second statement INPUT NUMBER executes. The INPUT statement is used to get data from the keyboard. It will:

• Print a question mark "?" to the screen.
• Wait until the user has typed in a number.
• Get the number when the user hits the "enter" key.
• Put the number in the variable NUMBER.

Just after this statement starts the monitor will look something like:

Type a number
? 

The question mark came from the INPUT statement. The INPUT statement is waiting for the user (you) to type a number. Say that you type 23. Now the monitor looks like:

Type a number
? 23

To enter the number, hit the enter key. The INPUT statement puts the 23 into the variable NUMBER. Next, the PRINT statement executes.