compresie.cpp: In function 'int main()': compresie.cpp:55: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result compresie.cpp:56: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result compresie.cpp:58: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result /tmp/ccFDoZEg.o: In function `main': compresie.cpp:(.text+0x25b): warning: the `gets' function is dangerous and should not be used.