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The for statement implements an iterative loop and requires you to specify the num-
ber of iterations. The syntax of the for statement is:

for counter = initial_value to final_value [step step_value]

statements

next counter

counter

is a variable being increased by 

step_value

with each iteration of the loop.

The parameter 

step_value

is an optional integral value, and defaults to 1 if omit-

ted. Before the first iteration, 

counter

is set to 

initial_value

and will be incre-

mented until it reaches (or exceeds) the 

final_value

. With each iteration, state-

ments will be executed.

initial_value

and 

final_value

should be expressions compatible with 

counter

;

statements

can be any statements that do not change the value of 

counter

.

Note that the parameter 

step_value

may be negative, allowing you to create a

countdown.

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

a

and 

b

, of length

n,

using the for statement:

s = 0
for i = 0 to n-1

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

next i

The for statement results in an endless loop if 

final_value

equals or exceeds the

range of the 

counter’s

type.

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- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 5