kinder.cpp: In function 'void read(int&)': kinder.cpp:13: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result kinder.cpp:21: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result kinder.cpp: In function 'int main()': kinder.cpp:141: warning: suggest explicit braces to avoid ambiguous 'else' kinder.cpp:99: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result kinder.cpp:100: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result kinder.cpp:103: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result