Compilare: user.cpp: In function ‘int main()’: user.cpp:15:6: warning: statement has no effect [-Wunused-value] for(u;u>0;u--) ^ user.cpp:23:6: warning: statement has no effect [-Wunused-value] for(n;n>0;n--) ^ user.cpp:28:10: warning: statement has no effect [-Wunused-value] for(i;i>0;i--) ^ user.cpp:43:6: warning: statement has no effect [-Wunused-value] for(m;m>0;m--) ^ user.cpp:47:10: warning: statement has no effect [-Wunused-value] for(i;i>0;i--) ^ user.cpp:63:14: warning: statement has no effect [-Wunused-value] for(j;j>0;j--) ^