Compilare: user.cpp: In function ‘int main()’: user.cpp:10:12: warning: unused variable ‘l’ [-Wunused-variable] int i,j,k,l; ^ user.cpp:27:6: warning: unused variable ‘a’ [-Wunused-variable] int a,b,p; ^ user.cpp:27:8: warning: unused variable ‘b’ [-Wunused-variable] int a,b,p; ^ user.cpp:27:10: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] int a,b,p; ^