Methods of Handling Errors

Whenever possible, the Visual Fortran RTL does certain error handling, such as generating appropriate messages and taking necessary action to recover from errors. You can explicitly supplement or override default actions by using the following methods:

• To transfer control to error-handling code within the program, use the END, EOR, and ERR branch specifiers in I/O statements, see Using the END, EOR, and ERR Branch Specifiers.
• To identify Fortran-specific I/O errors based on the value of Visual Fortran RTL error codes, use the I/O status specifier (IOSTAT) in I/O statements (or call the ERRSNS subroutine), see Using the IOSTAT Specifier and Fortran Exit Codes.

These error-processing methods are complementary; you can use any or all of them within the same program to obtain Visual Fortran run-time error codes.