Borderou de evaluare (job #307625)

Compilare: user.cpp: In function ‘int main()’: user.cpp:41:24: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] user.cpp:46:25: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] user.cpp:56:21: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] user.cpp:60:25: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] user.cpp:92:28: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] user.cpp:97:29: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] user.cpp:107:21: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] user.cpp:111:25: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] user.cpp:142:28: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] user.cpp:147:29: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] user.cpp:157:21: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] user.cpp:161:25: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] user.cpp:16:13: warning: unused variable ‘c2’ [-Wunused-variable] user.cpp:13:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:14:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]