foo.cc: In function ‘int main()’:
foo.cc:8:15: error: ‘cc’ was not declared in this scope; did you mean ‘c’?
    8 |         while(cc)
      |               ^~
      |               c
foo.cc:7:23: warning: unused variable ‘c’ [-Wunused-variable]
    7 |         int aa=a,bb=b,c=aa%bb;
      |                       ^