How to debug Pascal runtime error?

Question

I have a Pascal program built with TMT compiler that runs on Windows 95. Sometimes it fails with a runtime error like:

Error 207 at <adress>

I would like to at least determine where the error actually occured.

Answer 1

Error 207 is generally an Invalid floating point operation. This is the case in both free pascal and TMT's framework pascal.

Sometimes this occurs when you do not return a value from your functions. Try checking that you assign return values in functions like these:

function yourFunction(x:real) : real;
var
  someValue : real;
begin
  someValue := 42;
  yourFunction := someValue;
end;

In this case you should make sure that you are assigning your return

yourFunction := someValue;

A 207 error gennerally means that you have some variable that hasn't been initialized properly.