Re: How, using I4GL, do you evaluate a numerical expression held in a CHAR variable?

Paul Wheeler wrote: > > Does anybody remember the 'EVAL' command in Basic? It allows you to > compose a > string variable, e.g. A$="((127-82)/42)*27.5" and then assign the value of > the string into > a numeric variable, i.e. A=EVAL(A$). > > Currently I am using a SQL query to do this calculation for me and it is > proving inefficient. > I'm sure there is a 'text book answer' for this solution, something along > the lines of calling a function > with a pre-constructed string, and for it to return the evaluated answer > with a level of decimal > precision. > > Any ideas would be gratefully appreciated. > > Paul Wheeler. Hi, Paul ! Go to the GNU site and take a look on Bison and Flex packages. They are the tools for writing lexical analyzers, and are free of charge (and they works !). Cheers. Claudio Duffini