What are common errors when compiling a simple Fortran code?

[MathematicalPhysicist]

So I have a Ubuntu machine with gfortran installed in it.

I wrote the following simple code in fortran:

program calculation
   print *, 55+55
end program calculation

I saved it as 'calculation.f' file and then tried to compile it in the terminal, but got the following errors:

calculation.f:1:1:

 program calculation
 1
Error: Non-numeric character in statement label at (1)
calculation.f:1:1:

 program calculation
 1
Error: Unclassifiable statement at (1)
calculation.f:3:1:

 end program calculation
 1
Error: Non-numeric character in statement label at (1)
calculation.f:3:1:

 end program calculation
 1
Error: Unclassifiable statement at (1)
f951: Error: Unexpected end of file in ‘calculation.f’

Where did I go wrong here?

Thanks.

 

[DrClaude]

You didn't paste the error you got, but I suspect what it is. Since you are using free form, not the fixed column format (left over from the punch card era), the filename should end in .f90 instead of .f.

 

[MathematicalPhysicist]

Works fine now.