Compilare: user.cpp: In function ‘int main()’: user.cpp:26:9: warning: unused variable ‘n’ [-Wunused-variable] int n,last,a,b; ^ user.cpp:59:15: warning: ‘b’ may be used uninitialized in this function [-Wmaybe-uninitialized] int sum=a+b; ^ user.cpp:59:15: warning: ‘a’ may be used uninitialized in this function [-Wmaybe-uninitialized]