Compilare: user.cpp: In function ‘int main()’: user.cpp:9:12: warning: unused variable ‘m’ [-Wunused-variable] int n, m, a, b, c=0, d=0; ^ user.cpp:9:21: warning: unused variable ‘c’ [-Wunused-variable] int n, m, a, b, c=0, d=0; ^ user.cpp:9:26: warning: unused variable ‘d’ [-Wunused-variable] int n, m, a, b, c=0, d=0; ^