Compilare: user.cpp: In function ‘int main()’: user.cpp:56:9: warning: unused variable ‘i’ [-Wunused-variable] int i=1,j=1; ^ user.cpp:56:13: warning: unused variable ‘j’ [-Wunused-variable] int i=1,j=1; ^ user.cpp:57:9: warning: unused variable ‘p_1’ [-Wunused-variable] int p_1=1,p_2=1; ^ user.cpp:57:15: warning: unused variable ‘p_2’ [-Wunused-variable] int p_1=1,p_2=1; ^