ech.cpp: In function 'int main()': ech.cpp:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result ech.cpp:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result ech.cpp:11: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result ech.cpp:38: warning: 'poz' may be used uninitialized in this function /tmp/ccrEGg6U.o: In function `main': ech.cpp:(.text+0x8a): warning: the `gets' function is dangerous and should not be used.