/in/foo.cc: In function 'int main()':
/in/foo.cc:14:10: warning: 'x2' may be used uninitialized [-Wmaybe-uninitialized]
   14 |         y=(x-x2*(int)pow(10,n-1))*10+x2;
      |         ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc:6:20: note: 'x2' was declared here
    6 |         int x,y,x1,x2,n=0;
      |                    ^~