Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:18: error: ‘v’ was not declared in this scope user.cpp:21: warning: suggest parentheses around assignment used as truth value user.cpp:28: error: ‘v’ was not declared in this scope user.cpp:14: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result