Compilare: main.cpp: In function 'char readch()': main.cpp:14:29: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(s, BUFF, 1, stdin); ^ main.cpp: In function 'int main()': main.cpp:72:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dk.in", "r", stdin); ^ main.cpp:73:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dk.out", "w", stdout); ^ main.cpp: In function 'int readnr()': main.cpp:22:20: warning: 'ch' is used uninitialized in this function [-Wuninitialized] return ch >= '0' && ch <= '9'; ~~~~~~~~~~^~~~~~~~~~~~ main.cpp:26:8: note: 'ch' was declared here char ch; ^~