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

You're using the wrong notation for 'not equal to'. Fortran syntax is /= or .NE..

So you should be using:

if (prim(i) /= 0 .and. modulo(n, prim(i)) == 0) then

and

if (prim(i) /= 0) then

Furthermore, your syntax of integer(sqrt(real(m))) is incorrect, perhaps you mean NINT(sqrt(real(m)))?