Borderou de evaluare (job #550998)

Compilare: user.cpp: In function ‘int main()’: user.cpp:107:18: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] user.cpp:159:14: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] user.cpp:96:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:97:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:101:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:157:29: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:152:9: warning: ‘n’ may be used uninitialized in this function [-Wuninitialized]