foo.cc: In function 'Matrix operator*(Matrix, Matrix)':
foo.cc:225:21: warning: unused variable 'nX' [-Wunused-variable]
  225 |                 int nX = 0, nY = 0, nZ = 0;
      |                     ^~
foo.cc:225:29: warning: unused variable 'nY' [-Wunused-variable]
  225 |                 int nX = 0, nY = 0, nZ = 0;
      |                             ^~
foo.cc:225:37: warning: unused variable 'nZ' [-Wunused-variable]
  225 |                 int nX = 0, nY = 0, nZ = 0;
      |                                     ^~
foo.cc: In function 'int main(int, char**)':
foo.cc:246:25: warning: unused variable 'nX' [-Wunused-variable]
  246 |         int nValue = 4, nX = 0, nY = 0, nZ = 0;
      |                         ^~
foo.cc:246:33: warning: unused variable 'nY' [-Wunused-variable]
  246 |         int nValue = 4, nX = 0, nY = 0, nZ = 0;
      |                                 ^~
foo.cc:246:41: warning: unused variable 'nZ' [-Wunused-variable]
  246 |         int nValue = 4, nX = 0, nY = 0, nZ = 0;
      |                                         ^~

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