Compilare: user.cpp: In function 'int main()': user.cpp:52: warning: comparison between signed and unsigned integer expressions user.cpp:72: warning: comparison between signed and unsigned integer expressions user.cpp:91: warning: comparison between signed and unsigned integer expressions user.cpp:111: warning: comparison between signed and unsigned integer expressions user.cpp:122: warning: comparison between signed and unsigned integer expressions user.cpp:47: warning: 'p1' may be used uninitialized in this function user.cpp:47: warning: 'p2' may be used uninitialized in this function