Compilare: user.cpp: In function ‘int main()’: user.cpp:17:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (n=x/2;n<=y;n++) ^ user.cpp:27:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (((n*tc)+tc)>=x && ((n*tc)+tc)<=y) {g<<tc<<" "<<n; o=0; break;} ^ user.cpp:27:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (((n*tc)+tc)>=x && ((n*tc)+tc)<=y) {g<<tc<<" "<<n; o=0; break;} ^