Now available for "friendly use", f2c converts Fortran 77 source code to C. By default, it tries for bit-level compatibility with f77. Usage: f2c [flags] file ... File names must end in .f or .F; corresponding .c files are produced in the current directory (unless no file arguments are given, in which case f2c acts as a filter). `man f2c` describes flags and other details. Bug reports to dmg.