Eroare de compilare: main.cpp: In function 'int read()': main.cpp:20:34: error: 'isdigit' was not declared in this scope while (!isdigit(ch = nextch())); ^ main.cpp:22:33: error: 'isdigit' was not declared in this scope while (isdigit(ch = nextch())) x = 10 * x + ch - '0'; ^ main.cpp: In function 'char nextch()': main.cpp:14:63: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] if (pos == BUF_SIZE) fread(buf, BUF_SIZE, 1, fin), pos = 0; ^ Non zero exit status: 1