Very short comparison of Fortran90 and C. This has
basically everything you need to write your subroutines
for the mdmorse code:

  Declaring variables
  -------------------

Fortran90				C
---------				-------

real(double)				double
integer					int



  Relational operations
  ---------------------

  Same except that != in C is /= in Fortan


  Logical operations
  ------------------

Fortran90				C
---------				-------

.and. 					&&
.or.					||
.not.					! 


  Arithmetic
  ----------

  Identical to C, except that +=, ++, -- etc. is missing.
  You can easily replace these with i=i+1 ja i=i-1 and so on.


  Commands:
  ---------

Fortran90				C
---------				-------------------------

do i=1,N				for (i=1;i<=N;i++) {
  ...					   ...
enddo					}


if (i <= n) then			if (i<=n) {
  ...
else					} else {
  ...
endif  					}


cycle					continue;

exit					break;

  Subroutines
  -----------

stop 'End of program'			exit(0);

call subprogram(x)			subprogram(&x)


subroutine subprogram(x)		subprogram(x)
implicit none

   real(double) x			double *x;



  Input-output
  ------------

open(10,file="outfile")			fp=fopen("outfile","w")

write (10,*) "Cu",x			fprintf(fp,"%s %g\n","Cu",x);

close(10)				fclose(fp)





Note that all parameters passed to subroutines in Fortran
are by default passed by reference, not by value as
in C. Hence to get the C correspondence you need to use &x.