Compilare: user.cpp:81:2: warning: no newline at end of file user.cpp: In function 'int main()': user.cpp:76: warning: name lookup of 'sum' changed user.cpp:68: warning: matches this 'sum' under ISO standard rules user.cpp:74: warning: matches this 'sum' under old rules user.cpp: In function 'int cifra(int, int)': user.cpp:59: warning: control reaches end of non-void function user.cpp: In function 'int main()': user.cpp:76: warning: 'sum' is used uninitialized in this function