/in/foo.cc: In function 'int main()':
/in/foo.cc:16:6: warning: left operand of comma operator has no effect [-Wunused-value]
  if(a==3,b==7)
     ~^~~
/in/foo.cc:18:7: warning: left operand of comma operator has no effect [-Wunused-value]
   if(a==10,b==3)
      ~^~~~
/in/foo.cc:20:6: warning: left operand of comma operator has no effect [-Wunused-value]
  if(a==2,b==3)
     ~^~~
/in/foo.cc:22:7: warning: left operand of comma operator has no effect [-Wunused-value]
   if(a==2,b==5)
      ~^~~
/in/foo.cc:14:10: warning: unused variable 'temp' [-Wunused-variable]
  int a,b,temp,ans,num;
          ^~~~
/in/foo.cc:14:15: warning: unused variable 'ans' [-Wunused-variable]
  int a,b,temp,ans,num;
               ^~~
/in/foo.cc:14:19: warning: unused variable 'num' [-Wunused-variable]
  int a,b,temp,ans,num;
                   ^~~