ABL electronic PIC12 Benutzerhandbuch

Iteration statements let you loop a set of statements. There are three forms of itera-
tion statements in C: 

while

, 

do

, and 

for

.

Use the 

while

keyword to conditionally iterate a statement. Syntax of 

while

statement is:

(

expression) statement

The 

statement

executes repeatedly until the value of expression is false. The test

takes place before 

statement

executes. Thus, if 

expression

evaluates to false

on the first pass, the loop does not execute.

Parentheses around 

expression

are mandatory.

Here is an example of calculating scalar product of two vectors, using the 

while

statement:

s = 0, i = 0;

(i < n) {

s += a[i] * b[i];

i++;

}

Note that body of a loop can be a null statement. For example:

(*q++ = *p++);

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