Eroare de compilare: main.cpp: In function 'int read_u32()': main.cpp:31:31: error: 'isdigit' was not declared in this scope while (!isdigit(c = read_ch()) && c != '-'); ^ main.cpp:38:30: error: 'isdigit' was not declared in this scope while (isdigit(c = read_ch())) { ^ main.cpp: In function 'char read_ch()': main.cpp:23:33: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(_in_buff, 1, 4096, _fin); ^ main.cpp: In function 'int main()': main.cpp:103:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("lanterna.out", "w", stdout); ^ Non zero exit status: 1