foo.cc: In function 'int main()':
foo.cc:14:8: warning: unused variable 'w' [-Wunused-variable]
  int n,w=0,m=0;
        ^
foo.cc:14:12: warning: unused variable 'm' [-Wunused-variable]
  int n,w=0,m=0;
            ^
foo.cc:15:8: warning: unused variable 'wscore' [-Wunused-variable]
  float wscore=0,mscore=0,avg=0;
        ^~~~~~
foo.cc:15:17: warning: unused variable 'mscore' [-Wunused-variable]
  float wscore=0,mscore=0,avg=0;
                 ^~~~~~
foo.cc:15:26: warning: unused variable 'avg' [-Wunused-variable]
  float wscore=0,mscore=0,avg=0;
                          ^~~

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