Compilare: main.cpp: In function 'int read_int()': main.cpp:56:35: warning: array subscript has type 'char' [-Wchar-subscripts] while(!isDigit[c = read_char()]); ^ main.cpp:62:34: warning: array subscript has type 'char' [-Wchar-subscripts] while(isDigit[c = read_char()]); ^ main.cpp: In function 'char read_char()': main.cpp:29:56: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer, sizeof(char), BUFFER_SIZE, stdin); ^ main.cpp: In function 'int main()': main.cpp:74:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dbz.in", "r", stdin); ^ main.cpp:75:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dbz.out", "w", stdout); ^