Compilare: user.cpp: In function ‘int main()’: user.cpp:22: warning: comparison between signed and unsigned integer expressions user.cpp:12: warning: unused variable ‘t’ user.cpp:12: warning: ‘a’ may be used uninitialized in this function user.cpp:12: warning: ‘b’ may be used uninitialized in this function user.cpp:12: warning: ‘c’ may be used uninitialized in this function user.cpp:12: warning: ‘d’ may be used uninitialized in this function