Compilare: user.cpp: In function ‘void sub2()’: user.cpp:56:14: warning: unused variable ‘rez’ [-Wunused-variable] int i=0, rez=0, nr, enr; ^~~ user.cpp: In function ‘void sub1()’: user.cpp:50:9: warning: ‘sgn’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (sgn=='-') rez=rez-nr; ^~ user.cpp: In function ‘void sub2()’: user.cpp:87:13: warning: ‘sgn’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (sgn=='-') cn=cn-nr; ^~