Mikroelektronika MIKROE-742 데이터 시트

Assignment statements have the form:

variable := expression;

The statement evaluates expression and assigns its value to 

variable

. All the rules

of implicit conversion are applied. 

Variable

can be any declared variable or array

element, and 

expression

can be any expression.

Do not confuse the assignment with relational operator = which tests for equality. Also
note that, although similar, the construction is not related to the declaration of constants.

Compound statement, or block, is a list of statements enclosed by keywords begin
and end:

statements

Syntactically, a block is considered to be a single statement which is allowed to be
used when Pascal syntax requires a single statement. Blocks can be nested up to
the limits of memory.

For example, the 

while

loop expects one statement in its body, so we can pass it a

compound statement:

while i < n do

temp := a[i];

a[i] := b[i];
b[i] := temp;
i := i + 1;

Conditional or selection statements select one of alternative courses of action by
testing certain values. There are two types of selection statements:

- if 
- case 

163

- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 5