Eroare de compilare: user.cpp: In function ‘int get_number()’: user.cpp:13:31: error: ‘isdigit’ was not declared in this scope while(!isdigit(buffer[++p])); ^ user.cpp:15:28: error: ‘isdigit’ was not declared in this scope for(; isdigit(buffer[p]); ++p) ^ user.cpp: At global scope: user.cpp:25:37: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) void put_int(int x) ^~~~~~~ user.cpp:9:36: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) int get_number() ^~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:60:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cautbin.in", "r", stdin); ^ user.cpp:61:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cautbin.out", "w", stdout); ^ user.cpp:63:41: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, BUFFER_SIZE, stdin); ^