.ps 12 .vs 15 .nr PS 12 .nr VS 15 .TL Converting Fortran 77 to C .AU S. I. Feldman .AI Bellcore .AU D. M. Gay N. L. Schryer .AI .MH .OK .AB .PP Several Fortran to C converters commercially available, but none are useful for projects bigger than a few hundred lines; their error rates are measured in percents. For large-scale conversions, error rates near one in a million are needed. Having a reliable Fortran to C converter is of immense interest and value to our research, where we mix Fortran and C in various environments and architectures. .PP We will produce a Fortran 77 (f77) to C converter this summer, with the aid of a summer student, Mark Maimone, from Carnegie-Mellon University. The program will be based on the original f77 compiler written by S. I. Feldman many years ago and still in heavy use. .PP That compiler internally constructs a C parse-tree and then produces C intermediate code for the second pass of the C compiler. We will produce a C program from the internal C tree. .PP Feldman's collaboration in this project makes it possible \(em there is nothing like having the author of a program advise on its alteration. We expect to have the converter running in a matter of weeks. Since Feldman is at Bellcore and the work will be done at AT&T Bell Laboratories, we propose to put the resulting f77 to C converter software in the public domain. This will be accomplished by putting the program and its documentation through a publication release, from both AT&T and Bellcore. .PP .B This note is to advise the relevant parts of AT&T of the project and prepare the way for the subsequent release of the software and documentation. .R .AE .LP