APPENDIX A Input and output

Fortran’s READ and WRITE statements were introduced in a simple form early in this book so that statements could be written that would pass data from or to the processor’s default input or output (i/o) devices. It has been assumed that these default devices are a keyboard and a screen and that the format of the data takes a simple form. Appendix A. 1 describes the READ and WRITE statements more fully, and also a second output statement, PRINT. The rules of straightforward “list-directed” i/o and “unformatted” i/ o are also explained in detail, as are NAMELIST groups.