Borderou de evaluare (job #513673)

Compilare: user.cpp: In function 'int main()': user.cpp:10:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:19:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:20:25: warning: statement has no effect [-Wunused-value] user.cpp:22:34: warning: statement has no effect [-Wunused-value] user.cpp:51:8: warning: suggest parentheses around assignment used as truth value [-Wparentheses]