Compilare: user.cpp: In function ‘void back()’: user.cpp:116: warning: name lookup of ‘j’ changed user.cpp:7: warning: matches this ‘j’ under ISO standard rules user.cpp:92: warning: matches this ‘j’ under old rules user.cpp:121: warning: name lookup of ‘i’ changed user.cpp:7: warning: matches this ‘i’ under ISO standard rules user.cpp:66: warning: matches this ‘i’ under old rules user.cpp:152: warning: name lookup of ‘k’ changed user.cpp:8: warning: matches this ‘k’ under ISO standard rules user.cpp:131: warning: matches this ‘k’ under old rules user.cpp: In function ‘int main()’: user.cpp:177: warning: unused variable ‘csuma’