PowerBuilder Function Is Comparison Operator gf_is_comparison_operator
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///////////////////////////////////////////////////////////////////////////////////////////////////////////// // // Function Name : gf_is_comparison_operator // Argument Name : as_source, Arg Type : String, Pass By : Value // Return Type : Boolean /////////////////////////////////////////////////////////////////////////////////////////////////////////////// // Description: Determines whether a string contains only Comparison // Operator characters. /////////////////////////////////////////////////////////////////////////////////////////////////////////////// Long ll_count = 0 Long ll_length Char lc_char[] Integer li_ascii //Check parameters If IsNull(as_source) Then Boolean lb_null SetNull(lb_null) Return lb_null End If //Get the length ll_length = Len (as_source) //Check for at least one character If ll_length = 0 Then Return False End If //Move string into array of chars lc_char = as_source //Perform loop around all characters //Quit loop if Non Operator character is found Do While ll_count < ll_length ll_count ++ //Get ASC code of character. li_ascii = Asc (lc_char[ll_count]) If li_ascii = 60 Or /* < less than */ & li_ascii = 61 Or /* = equal */ & li_ascii = 62 Then /* > greater than */ //Character is an Comparison Operator. //Continue with the next character. Else Return False End If Loop // Entire string is made of Comparison Operators. Return True |
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