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Use this function to check if a value has already been assigned to the specified variable. If a value has been assigned, the function returns TRUE; otherwise a logical FALSE is returned. | |||||||
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Use this function to check if a variable has been initialized (the variable works like a flag). |
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Syntax: |
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{LOG_VAR}= known({VAR}) | ||||||||
I/O parameters:
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Return value: |
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Example: |
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Declaration of Variables | ||||||||
10 DOCU_STRING_1="abc" 20 if (known(DOCU_STRING_1)== TRUE) 30 put("Variable is initialized!") 40 else 50 DOCU_STRING_1="abc" 60 endif |
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Result: | ||||||||
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Functions and commands: Miscellaneous |