Borderou de evaluare (job #4897)

Compilare: user.cpp: In function ‘int main()’: user.cpp:5:19: warning: unused variable ‘c’ [-Wunused-variable] user.cpp:5:31: warning: unused variable ‘a’ [-Wunused-variable] user.cpp:3:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:4:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:6:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]