foo.cc: In function ‘int main()’:
foo.cc:7:14: warning: left operand of comma operator has no effect [-Wunused-value]
    7 |         if(x1>=1000000,x2>=1000000)
      |            ~~^~~~~~~~~
foo.cc:8:17: error: break statement not within loop or switch
    8 |                 break;
      |                 ^~~~~