Answer:

the keyboard --- an I/O device (even though it is just input)
a CD-ROM reader --- an I/O device (even though it is just input)
the CPU --- NOT an I/O device
the power supply --- NOT an I/O device
the printer cable --- NOT an I/O device
a floppy disk drive --- an I/O device

Notice that the CPU is not an I/O device. It constantly deals with data as it follows the instructions of your program, but is not a source of data for your program nor a destination of data from your program.

The `INPUT` Statement

QBasic uses the INPUT statement to input data from the keyboard. Here is a program that asks the user for a number, then prints out that number times two:

' 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

Here is how this program looks in the QBasic window:

These statements will execute one by one in sequence. To run the program push "shift-F5" or use the menu "alt-R, S" (as usual).

Answer:

The INPUT Statement

QUESTION 5:

The `INPUT` Statement