QBasic 1.1: IS Keyword

Explanation

SELECT CASE Statement

Executes one of several statement blocks depending on the value of an expression.

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Syntax

SELECT CASE testexpression

CASE expressionlist1

[statementblock-1]

CASE expressionlist2

[statementblock-2]...

CASE ELSE

[statementblock-n]

Description / Parameter(s)

testexpression

Any numeric or string expression.

expressionlist1

One or more expressions to match testexpression.

expressionlist2

The IS keyword must precede any relational operators in an expression.

statementblock-1
statementblock-2
statementblock-n

One or more statements on one or more lines.

The expressionlist arguments can have any of these forms or a combination of them, separated by commas:

expression[,expression]...
expression TO expression
IS relational-operator expression

expression	Any numeric or string expression compatible with testexpression.
relational-operator	One of the following relational operators: <, <=, >, >=, <>, or =.

Example


INPUT "Enter acceptable level of risk (1-5): ", Total
SELECT CASE Total

  CASE IS >= 5
    PRINT "Maximum risk and potential return."
    PRINT "Choose stock investment plan."

  CASE 2 TO 4
    PRINT "Moderate to high risk and potential return."
    PRINT "Choose mutual fund or corporate bonds."

  CASE 1
    PRINT "No risk, low return."
    PRINT "Choose IRA."

END SELECT