Compilare: user.cpp: In function ‘void afisare(float, float, float, float)’: user.cpp:15:32: warning: format ‘%f’ expects argument of type ‘double’, but argument 2 has type ‘int’ [-Wformat=] else printf("%.4f\n", 0); ^ user.cpp: In function ‘void rezolva(char*, float&, float&)’: user.cpp:32:23: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] p[l-1]=NULL; ^ user.cpp: In function ‘int main()’: user.cpp:56:11: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] *p=NULL; ^ user.cpp:48:35: warning: unused variable ‘nr’ [-Wunused-variable] float xd=0, nd=0, xs=0, ns=0, nr; ^ /tmp/cc8viL41.o: In function `main': user.cpp:(.text.startup+0xa3): warning: the `gets' function is dangerous and should not be used.