Compilare: main.cpp:63:30: warning: multi-character character constant [-Wmultichar] if(Ch >= '0' && Ch <=' 9') ^~~~ main.cpp: In function 'void Read()': main.cpp:90:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("parb2.in", "r", stdin); ^ main.cpp:91:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("parb2.out", "w", stdout); ^ main.cpp: In function 'char Char()': main.cpp:49:37: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, BSIZE, stdin); ^