parpal.cpp: In function 'int main()': parpal.cpp:19: warning: comparison between signed and unsigned integer expressions parpal.cpp:13: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result parpal.cpp:14: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result parpal.cpp:17: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result parpal.cpp:25: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result /tmp/ccKcOC86.o: In function `main': parpal.cpp:(.text+0x66): warning: the `gets' function is dangerous and should not be used.