ghinion.cpp: In function 'int main()': ghinion.cpp:10: warning: unused variable 'n' ghinion.cpp:10: warning: unused variable 'm' ghinion.cpp:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result ghinion.cpp:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result ghinion.cpp:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result ghinion.cpp:13: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result ghinion.cpp:15: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result ghinion.cpp:17: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result /tmp/cciT8I8E.o: In function `main': ghinion.cpp:(.text+0x8d): warning: the `gets' function is dangerous and should not be used.