/in/foo.cc: In function 'int main()':
/in/foo.cc:5:23: warning: unused variable 'nh' [-Wunused-variable]
  int h,m,s,k,zh,zm,zs,nh,nm,ns;
                       ^~
/in/foo.cc:5:26: warning: unused variable 'nm' [-Wunused-variable]
  int h,m,s,k,zh,zm,zs,nh,nm,ns;
                          ^~
/in/foo.cc:5:29: warning: unused variable 'ns' [-Wunused-variable]
  int h,m,s,k,zh,zm,zs,nh,nm,ns;
                             ^~