View Compilation Error

0_0_14832137_5869.cpp: In function 'int main()':
0_0_14832137_5869.cpp:15:32: error: 'scanf' was not declared in this scope
     while (scanf("%d%d", &m, &n), m || n)
                                ^
0_0_14832137_5869.cpp:18:40: error: 'puts' was not declared in this scope
             puts(m > n ? "OK" : "Sorry");
                                        ^