Relational Expressions |
DEVELOPER |
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Relational Expressions |
DEVELOPER |
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A relational expression tests a specific relationship between two values. It returns a value of True if the relationship is true and a value of False if the relationship is not true. A relational expression consists of two constants, variables, or expressions (of the same type) separated by one of the relational operators listed below.
Relational operators is as follows:
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Symbol |
Purpose |
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= |
Equal |
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# or <> |
Not equal |
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> |
Greater than |
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< |
Less than |
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>= |
Greater than or equal to |
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<= |
Less than or equal to |
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IN-RANGE |
Range check (alphanumeric, wide, and numeric) |
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IN-ALPHA |
Alphanumeric or wide match |
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The IN-RANGE and IN-ALPHA relational operators can apply to wide fields provided that both strings are of the same type. |
Relational expressions are often used as tests in PROIV conditional and repetitive statements. Examples:
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COUNTER < 100 |
This expression tests the variable COUNTER to see if it is less than 100 |
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IF BALANCE >= LIMIT |
This logic determines if a customer's current BALANCE is greater than or equal to their credit LIMIT. The statements between THEN and ENDIF are executed only if the expression BALANCE >= LIMIT evaluates to True. |
Topic ID: 520009