Compilare: user.cpp: In function ‘int main()’: user.cpp:12:9: warning: unused variable ‘counter’ [-Wunused-variable] int counter=0; ^ user.cpp:14:9: warning: unused variable ‘k’ [-Wunused-variable] int k; ^ user.cpp:16:9: warning: unused variable ‘sq1’ [-Wunused-variable] int sq1=0,sq2=0,sq3=0; ^ user.cpp:16:15: warning: unused variable ‘sq2’ [-Wunused-variable] int sq1=0,sq2=0,sq3=0; ^ user.cpp:16:21: warning: unused variable ‘sq3’ [-Wunused-variable] int sq1=0,sq2=0,sq3=0; ^