Compilare: user.cpp: In function ‘void read()’: user.cpp:52: warning: comparison between signed and unsigned integer expressions user.cpp:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:46: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:49: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp: In function ‘void print()’: user.cpp:88: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result /tmp/ccGzu0Jd.o: In function `read()': user.cpp:(.text+0x1b9): warning: the `gets' function is dangerous and should not be used.