foo.cc: In member function 'void Matrix::in()':
foo.cc:12:16: warning: format '%c' expects argument of type 'char*', but argument 2 has type 'int*' [-Wformat=]
   12 |       scanf(" %c",a[i]+j);
      |               ~^  ~~~~~~
      |                |      |
      |                char*  int*
      |               %d
foo.cc: In function 'int main()':
foo.cc:41:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   41 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
foo.cc: In member function 'void Matrix::in()':
foo.cc:12:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   12 |       scanf(" %c",a[i]+j);
      |       ~~~~~^~~~~~~~~~~~~~

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Found 7 testcases.
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