Hi, Guys

How to compile the following fortran code by f77

Program 'test'

# include "head1.h"

# include "head2.h"

a=1

b=2

c=3

call test(b,

& include "head2.h"

end

*********************************

subroutine test(1,

& include "head2.h" # include "head1.h"

print*,a,b,c

return

end

***************************

head1.h includes the following line

# define _tes a

****************************

head2.h includes the following line

# real*8 c

a interesting thing. a old style of programming. it seems the code is written by mixing languages c and fortran. the main part is coded by f77 except the definition of variables by C language. Since the code never call any C-language subroutine, I really get lost. How to complie this type of codes? any hint would be appreciated.

Change the name of the file from program.f to program.F and it will compile on almost all a unix-like systems.

The statements beginning with #include are for the cpp program which is the C pre-processor. Capitalising the extension is the naming convention for first running a program through cpp on unix-like systems.

FORTRAN, unlike C, is a portable language and does not understand directories which are different on different systems. Hence FORTRANs include can only look in the same directory as the main file. This is not how include files are usually used for larger programs hence the switch to using cpp for many using unix-like systems.

Done!thank you very much.