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BASIC COMMANDS AND STATEMENTS

3.14

FOR

.

..

NEXT

Purpose:

Loops a

round

a

group

of

instructions

a

specified

number

of

times.

Format:

FOR

variable

= n

TO

m

[STEP

i]

NEXT

[variable]

[.variable]

...

Comments:

The

variable

-

which

is

optional

with

the

NEXT

-

acts

as a

counter

for

the

number

of

times

the

instructions

within

the

loop

surrounded

by

the

FOR

and

NEXT

are

executed.

n is

the

initial

value

of

the

counter,

m

is

the

final

value

of

the

counter,

and

i

is

the

step

or

increment.

All

the

instructions

in

the

l

oop

are

executed

down

to

the

NEXT.

Then

the

counter

is

increm

e

nted

by

i.

(If

you

do

not

give

a

value

for

i,

the

BASIC

interpreter

assumes

i is

one.)

Then

a c

he

ck

to

see

whether

the

value

of

the

counter

is

greater

than

m

follows

.

If

it

is

not,

the

loop is

gone

through

again.

If

it

is

greater

than

m,

then

the

program

continues

with

the

instructions

that

follow

the

NEXT

statement.

11-40

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