kinder.cpp: In function 'int main()': kinder.cpp:142: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result kinder.cpp:143: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result kinder.cpp:145: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result kinder.cpp:151: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result kinder.cpp:155: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result kinder.cpp:164: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result