View Compilation Error

0_0_38484288_12719.cpp: In function 'int main()':
0_0_38484288_12719.cpp:8:44: error: 'scanf' was not declared in this scope
     while (scanf("%d%d%d%d", &a, &b, &c, &d) && ~a && ~b && ~c && ~d) {
                                            ^
0_0_38484288_12719.cpp:12:90: error: 'printf' was not declared in this scope
                 printf("Case %d: the next triple peak occurs in %lld days.\n", ++T, i - d);
                                                                                          ^