variable initialization

[Pfor]

Dear all,
I have been wasting some time to understand an error
which was rather trivial, I forgot to initialize
an index in a subroutine. As a result, no compiler gave me
any error but when executed the code gave me
different results for different compilers/computers.

My question is thus: is there a fortran instruction which forces
all the variables (arrays included)
to be zero when first created (or allocated)?

If I am not wrong using the option -zero when compiling with ifort does it but only for scalars, moreover I would prefer to force it in the code
itself.
Do you have any suggestion?
cheers,
Paolo

 

[xwb]

It is better that you initialize all variables yourself. That way you know that they all have legal values before you use them. Zero might not be a legal value for some variables.

Some compilers will warn you if you are using an uninitialized variable.