Syntax error when using “X != 0” in Fortran

Question

I have a problem with my Fortran program that does nothing more than calculating a prime factorization (or should do). That\'s the error:

C:\\MinGW\\Fortran>         


        

Answer 1

The token for "not equals" in fortran is /= . ! starts a comment, hence the compiler reading line 15 as

        if (prim(i) 

and so is confused because there is no bracket to close the logical expression in the if statement. So simply replace != with /= and it should get rid of this problem.