foo.cc: In function 'Matrix operator*(Matrix, Matrix)':
foo.cc:247:21: warning: unused variable 'nX' [-Wunused-variable]
  247 |                 int nX = 0, nY = 0, nZ = 0;
      |                     ^~
foo.cc:247:29: warning: unused variable 'nY' [-Wunused-variable]
  247 |                 int nX = 0, nY = 0, nZ = 0;
      |                             ^~
foo.cc:247:37: warning: unused variable 'nZ' [-Wunused-variable]
  247 |                 int nX = 0, nY = 0, nZ = 0;
      |                                     ^~
foo.cc: In function 'int main(int, char**)':
foo.cc:290:13: warning: unused variable 'nValue' [-Wunused-variable]
  290 |         int nValue = 4, nX = 0, nY = 0, nZ = 0;
      |             ^~~~~~

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