/in/foo.cc: In function 'int main()':
/in/foo.cc:5:22: warning: variable 'i' set but not used [-Wunused-but-set-variable]
  int a,b,c,d,e,f,g,h,i,j,k,l,m,n,o;
                      ^
/in/foo.cc:5:24: warning: variable 'j' set but not used [-Wunused-but-set-variable]
  int a,b,c,d,e,f,g,h,i,j,k,l,m,n,o;
                        ^
/in/foo.cc:5:26: warning: variable 'k' set but not used [-Wunused-but-set-variable]
  int a,b,c,d,e,f,g,h,i,j,k,l,m,n,o;
                          ^
/in/foo.cc:5:28: warning: variable 'l' set but not used [-Wunused-but-set-variable]
  int a,b,c,d,e,f,g,h,i,j,k,l,m,n,o;
                            ^
/in/foo.cc:5:30: warning: variable 'm' set but not used [-Wunused-but-set-variable]
  int a,b,c,d,e,f,g,h,i,j,k,l,m,n,o;
                              ^
/in/foo.cc:5:32: warning: variable 'n' set but not used [-Wunused-but-set-variable]
  int a,b,c,d,e,f,g,h,i,j,k,l,m,n,o;
                                ^
/in/foo.cc:5:34: warning: variable 'o' set but not used [-Wunused-but-set-variable]
  int a,b,c,d,e,f,g,h,i,j,k,l,m,n,o;
                                  ^
/in/foo.cc:33:12: warning: 'h' may be used uninitialized in this function [-Wmaybe-uninitialized]
     cout<<h;
            ^