rima.cpp: In function 'int main()': rima.cpp:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result rima.cpp:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result rima.cpp:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result rima.cpp:11: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result rima.cpp:14: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result rima.cpp:15: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result rima.cpp:16: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result rima.cpp:17: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result /tmp/ccKu518k.o: In function `main': rima.cpp:(.text+0x9d): warning: the `gets' function is dangerous and should not be used.