What is a run-time error?

A run-time error occurs after a program is compiled (if you are using C++ or Pascal) and when the program is run. It may be caused by the input data, such as an overflow error, or it may simply be the result of running the program.

How do I read from a file

See File Use Examples for details on how to read from a file.

Are the programs required to write to a data file?

No. All program output should be directed to the screen or to the form (in Visual Basic 6.0).