Which parts of the computer can store program code? Which can store user data?
Memory (permanent or temporary) can store both program code (for the machine to run) and user data (for the program to work on it). So can most of the registers in the CPU. The distinction between program code and user data is not that precise, because one person’s program code is someone else’s user data. For example, think of your code, which is processed by the compiler. To summarize we can say that program code can be looked at as user data. (But there is some data that is not program code). • Which parts of the computer serve to give information to the user? Which parts take user input? The monitor and the speakers are output devices. The mouse, keyboard, a microfone, and sometimes the monitor (touch screen) can be input devices. There may well be other non-standard input and output devices. • What is the Java virtual machine? It is an interpreter: a computer program that runs Java bytecode instructions. • What is an applet? An applet is a small program that has already been compi
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