drum.cpp: In function 'int main()': drum.cpp:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result drum.cpp:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result drum.cpp:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result drum.cpp:13: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result drum.cpp:14: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result /tmp/ccGzlYh4.o: In function `main': drum.cpp:(.text+0x96): warning: the `gets' function is dangerous and should not be used.