Compilare: user.cpp: In function ‘void read()’: user.cpp:22: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result user.cpp:36: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘int main()’: user.cpp:139: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:140: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘void read()’: user.cpp:21: warning: ‘cnt’ may be used uninitialized in this function user.cpp:21: warning: ‘x’ may be used uninitialized in this function user.cpp:21: warning: ‘y’ may be used uninitialized in this function