On Jul 12, 2024, at 6:53 AM, Matthew Knepley <knepley@gmail.com> wrote:

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On Fri, Jul 12, 2024 at 2:26 AM Ivan Luthfi <ivanluthfi5@gmail.com> wrote:

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I have  warning:

FormatFunction.c: In function 'ComputeStiffnessMatrix':

FormatFunction.c:128:46: warning: '%d' directive writing between 1 and 11 bytes into a region of size between 0 and 99 [-Wformat-overflow]
(line128) sprintf(filename, "%sc%d_N%dM%d_permeability.log", up->problem_description, up->problem_flag, up->Nx, up->Mx)

do you know why this warning appear? and how to fix it.

You are writing a PetscInt into the spot for an int. You can

  1) Cast to int: 

sprintf(filename, "%sc%d_N%dM%d_permeability.log", up->problem_description, up->problem_flag, (int)up->Nx, (int)up->Mx)

  2) Use the custom format

sprintf(filename, "%sc%d_N%" PetscInt_FMT "M%" PetscInt_FMT "_permeability.log", up->problem_description, up->problem_flag, up->Nx, up->Mx)

  Thanks,

    Matt

 

-- 

Best regards,

--

-- 

What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.
-- Norbert Wiener

https://www.cse.buffalo.edu/~knepley/