Compilare: user.cpp: In function ‘void C2()’: user.cpp:43:9: warning: unused variable ‘x1’ [-Wunused-variable] int x1,x2,x3,x4; ^ user.cpp:43:12: warning: unused variable ‘x2’ [-Wunused-variable] int x1,x2,x3,x4; ^ user.cpp:43:15: warning: unused variable ‘x3’ [-Wunused-variable] int x1,x2,x3,x4; ^ user.cpp:43:18: warning: unused variable ‘x4’ [-Wunused-variable] int x1,x2,x3,x4; ^ user.cpp:44:12: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] char c,sol; ^ user.cpp:130:19: warning: ‘y’ may be used uninitialized in this function [-Wmaybe-uninitialized] fout<<x<<" "<<y<<"\n"<<sol<<"\n"; ^ user.cpp:130:11: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] fout<<x<<" "<<y<<"\n"<<sol<<"\n"; ^