/in/foo.cc: In function 'int main()':
/in/foo.cc:7:10: warning: left operand of comma operator has no effect [-Wunused-value]
    7 |       if(a,b,c==0) break;
      |          ^
/in/foo.cc:7:17: warning: right operand of comma operator has no effect [-Wunused-value]
    7 |       if(a,b,c==0) break;
      |                 ^