dir.cpp: In function 'int main()': dir.cpp:76: warning: comparison between signed and unsigned integer expressions dir.cpp:19: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result dir.cpp:20: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result dir.cpp:22: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result /tmp/ccCQLg6p.o: In function `main': dir.cpp:(.text+0xab): warning: the `gets' function is dangerous and should not be used.