Borderou de evaluare (job #517406)

Compilare: user.cpp: In function 'int main()': user.cpp:9:22: warning: unused variable 'z' [-Wunused-variable] user.cpp:9:52: warning: variable 'k' set but not used [-Wunused-but-set-variable] user.cpp:7:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] user.cpp:8:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] user.cpp:20:13: warning: 'c' may be used uninitialized in this function [-Wuninitialized]