/in/foo.cc: In function 'int main()':
/in/foo.cc:22:3: error: 'reverse' was not declared in this scope
   reverse=reverse*10+digit;
   ^~~~~~~
/in/foo.cc:25:16: error: 'reverse' was not declared in this scope
  printf("%d\n",reverse);
                ^~~~~~~
/in/foo.cc:18:6: warning: unused variable 'reserse' [-Wunused-variable]
  int reserse=0;
      ^~~~~~~