Coding style guide

When writing fortran code for ug3 and while setting up the user.fpp file, please follow these instructions.

• Look at the ug3 files to learn about the coding style.
• Do not use tab anywhere in the code, use spaces.
• Indent code for better readability.
• Indent by 3 spaces.
• Do not exceed 80 columns, though this is not strictly necessary.
• Do not put blank space at the end of a line.
• Try to use small variable names if possible.
• Do not use common block.
• Always use implicit none in every function/subroutine.
• Do not leave unused variables, unless they are part of standard subroutine arguments.
• Check all warnings given by compiler and fix them.
• When printing to screen, do it only on rank=0 process, unless there is a specific reason to print from every process.
• Do not use stop since this is a parallel program; use the abort0 and abort1 functions which cleanly aborts the program.
• Use == instead of .eq. and similarly for other comparison operators.
• Put space between comparison operators, e.g. if(nproc == 1).
• Put space between addition/subtraction a = b + c
• Put space between arguments to subroutine/function call foo(x, y, z)
• Dont put space in enddo and endif.
• Do not use too many brackets, unless you want to order the computations.