Compilare: user.cpp: In function ‘int main()’: user.cpp:31:67: warning: format ‘%d’ expects argument of type ‘int*’, but argument 2 has type ‘unsigned char*’ [-Wformat=] scanf ("%d %d %d %d\n", &source.x, &source.y, &sink.x, &sink.y); ^ user.cpp:31:67: warning: format ‘%d’ expects argument of type ‘int*’, but argument 3 has type ‘unsigned char*’ [-Wformat=] user.cpp:31:67: warning: format ‘%d’ expects argument of type ‘int*’, but argument 4 has type ‘unsigned char*’ [-Wformat=] user.cpp:31:67: warning: format ‘%d’ expects argument of type ‘int*’, but argument 5 has type ‘unsigned char*’ [-Wformat=]