Borderou de evaluare (job #13964)

Compilare: user.cpp: In function 'int main()': user.cpp:12:14: warning: format not a string literal and no format arguments [-Wformat-security] user.cpp:13:18: warning: NULL used in arithmetic [-Wpointer-arith] user.cpp:13:32: warning: NULL used in arithmetic [-Wpointer-arith] user.cpp:11:23: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] user.cpp:13:15: warning: 'i' is used uninitialized in this function [-Wuninitialized]