/in/foo.cc: In function 'int main()':
/in/foo.cc:44:9: warning: unused variable 'sum3' [-Wunused-variable]
     int sum3=0;
         ^~~~
/in/foo.cc:52:17: warning: 'p' may be used uninitialized in this function [-Wmaybe-uninitialized]
     for(ii=aa;ii<=p;ii++)
               ~~^~~