/in/foo.cc: In function 'int main()':
/in/foo.cc:9:6: error: lvalue required as left operand of assignment
    9 |     y*y=x;
      |     ~^~
/in/foo.cc:11:6: error: lvalue required as left operand of assignment
   11 |     j*j=x-i*i;
      |     ~^~