Rockwell-automation 1771-DB BASIC MODULE Manual de usuario descargar pdf (Pagina 167)

100

101

Chapter

Statements

11 -15

Use the IF-THEN-ELSE statement to set up a conditional test.

If you want to transfer control to different line numbers using the IF

statement, you may omit the GOTO statement. These examples give the

same results:

>20

IF INT(A)<10 THEN GOTO 100 ELSE GOTO 200

20 IF INT(A)<10 THEN 100 ELSE 200

You can replace the THEN statement with any valid BASIC module

statement:

>30

IF A<>10 THEN PRINT A ELSE 10

30 IF A<>10 PRINT A ELSE 10

You may execute multiple statements following the THEN or ELSE if you

use a colon to separate them:

>30

IF A<>10 THEN PRINT A : GOTO 150 ELSE 10

You may omit the ELSE statement. If you omit the ELSE statement

control passes to the next statement.

REM EXAMPLE PROGRAM

20 IF A=10 THEN 40

30 PRINT A

Syntax

rel expr

THEN

valid statement

ELSE

valid statement

Example

1 REM EXAMPLE PROGRAM

10 IF A =100 THEN A=0 ELSE A=A+1

Upon execution of line 10 IF A is equal to 100, THEN A is assigned a

value of 0. IF A does not equal 100, A is assigned a value of A+1.

IF-THEN-ELSE

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