Compilare: user.cpp: In function ‘int main()’: user.cpp:51: warning: comparison between signed and unsigned integer expressions user.cpp:58: warning: comparison between signed and unsigned integer expressions user.cpp:70: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘bool div(int)’: user.cpp:28: warning: control reaches end of non-void function user.cpp: In function ‘int main()’: user.cpp:43: warning: ‘nr’ may be used uninitialized in this function