Compilare: user.cpp: In function 'int main()': user.cpp:63: warning: comparison between signed and unsigned integer expressions user.cpp:85: warning: format '%d' expects type 'int', but argument 2 has type 'long int' user.cpp:87: warning: format '%d' expects type 'int', but argument 2 has type 'long int' user.cpp:90: warning: format '%d' expects type 'int', but argument 2 has type 'long int'