Compilare: user.cpp: In function ‘int main()’: user.cpp:23:22: warning: format ‘%c’ expects argument of type ‘char*’, but argument 2 has type ‘long int*’ [-Wformat=] scanf("%c%c",&v1,&v2); ^ user.cpp:23:22: warning: format ‘%c’ expects argument of type ‘char*’, but argument 3 has type ‘long int*’ [-Wformat=] user.cpp:24:23: warning: format ‘%c’ expects argument of type ‘int’, but argument 2 has type ‘long int’ [-Wformat=] printf("%c%c\n",v2,v1); ^ user.cpp:24:23: warning: format ‘%c’ expects argument of type ‘int’, but argument 3 has type ‘long int’ [-Wformat=]