ILOG OPL Development Studio Language Reference Manual

Automatic conversion to a stringWhen a function or a method which expects a string as one of its arguments is passed anonstring value, this value is automatically converted to a string. For example, if the stringmethod indexOf is passed a number as its first argument, this number is treated like itsstring representation:Similarly, operators which take string operands automatically convert nonstring operands tostrings:The conversion to a string uses the toString method of the given value. All built in valueshave a toString method.224I L O G O P L D E V E L O P M E N T S T U D I O L A N G U A G ER E F E R E N C E M A N U A L