foo.cc: In function 'int main()':
foo.cc:6:14: warning: right operand of comma operator has no effect [-Wunused-value]
     cin>>a,b,c;
              ^
foo.cc:6:15: warning: right operand of comma operator has no effect [-Wunused-value]
     cin>>a,b,c;
               ^
foo.cc:7:5: warning: 'b' is used uninitialized in this function [-Wuninitialized]
     if(b==1)
     ^~
foo.cc:13:7: warning: 'd' may be used uninitialized in this function [-Wmaybe-uninitialized]
      s=31+d;
      ~^~~~~
foo.cc:62:9: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized]
     cout<<s;
     ~~~~^~~

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