/in/foo.cc: In function 'bool isrn(int)':
/in/foo.cc:8:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:43:14: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
     cout<<ans;
              ^