Compilare: user.cpp: In function ‘void pre2()’: user.cpp:70:33: warning: unused variable ‘pop’ [-Wunused-variable] int x,i,j,copies=s,copiek=k,pop=0; ^ user.cpp: In function ‘void lee()’: user.cpp:80:7: warning: unused variable ‘i’ [-Wunused-variable] int k,i,j; ^ user.cpp:80:9: warning: unused variable ‘j’ [-Wunused-variable] int k,i,j; ^