UBI EasyCoder 201 IIE Manuel d'instructions télécharger pdf (Page 278)

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Chapter 2 Program Instructions

WHILE...WEND

Field of Application

Statement for executing a series of statements in a loop providing

a given condition is true.

Syntax WHILE <nexp>

<stmt>

[...<stmt>]

WEND

<nexp> is a numeric expression that is either TRUE (-1) of FALSE

(0).

<stmt> is a statement, or a list of statements on separate lines, that

will be executed provided <nexp> is TRUE.

Remarks

If <nexp> is TRUE, all following statements will be executed successively

until a WEND statement is encountered. The program execution then

goes back to the WHILE statement and repeats the process, provided

<nexp> still is TRUE.

If <nexp> is FALSE, the execution resumes at the statement following

the WEND statement.

WHILE...WEND statements can be nested. Each WEND matches the

most recent WHILE statement.

Example

In this example, the WHILE...WEND loop will only be executed if the character

“Y” (ASCII 89 dec.) is entered on the keyboard of the host.

10 B%=0

20 WHILE B%<>89

30 INPUT "Want to exit? Press Y=Yes or N=No ",A$

40 B%=ASC(A$)

50 WEND

60 PRINT "The answer is Yes"

70 PRINT "You will exit the program"

80 END

RUN

yields:

Want to exit? Press Y=Yes or N=No N

Want to exit? Press Y=Yes or N=No Y

The answer is Yes

You will exit the program

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UBI EasyCoder 201 IIE Manuel d'instructions Page 278