Motorola Axiom CMD11E1 Guía de usuario descargar pdf (Pagina 49)

Chapter 4

Programs

4.1 Objective

To b ecome familiar with writing programs. This lab also illustrates the use of

assembler directives.

4.2 What you should do

You will have to turn in your LST ﬁles for the programs you write for this lab.

Check with the TA for additional instructions.

4.3 Programs

When you write programs in a high level language such as C, C++, Java, the

compiler facilitates modular program development using function. In an earlier

lab, we discussed some basic rules for writing functions. Another facility that

higher level languages provides is the use of variables. Key features of variables

in high level languages are:

1. Variables generally have a name and you use the name to manipulate them.

2. Variables have a type. The compiler keeps track of the type and makes sure

that the way a variable is used conforms to its type.

3. Compiler negotiates with the operating system to obtain adequate memory

for the variable.

4. Compiler makes sure that a memory allocated to a variable is not acciden-

tally also allocated to another variable

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Motorola Axiom CMD11E1 Guía de usuario Pagina 49