foo.cc: In function 'int main()':
foo.cc:6:7: warning: unused variable 'ch1' [-Wunused-variable]
    6 |  char ch1,ch2;
      |       ^~~
foo.cc:6:11: warning: unused variable 'ch2' [-Wunused-variable]
    6 |  char ch1,ch2;
      |           ^~~
foo.cc:8:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    8 |  scanf("%d,%d,%d",&x,&y,&z);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~

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