Compilare: user.cpp: In function ‘int main()’: user.cpp:8:13: warning: unused variable ‘ca’ [-Wunused-variable] int a,b,ca=a,cb=b; ^ user.cpp:8:18: warning: unused variable ‘cb’ [-Wunused-variable] int a,b,ca=a,cb=b; ^ user.cpp:8:16: warning: ‘a’ is used uninitialized in this function [-Wuninitialized] int a,b,ca=a,cb=b; ^ user.cpp:8:21: warning: ‘b’ is used uninitialized in this function [-Wuninitialized] int a,b,ca=a,cb=b; ^