View Compilation Error

0_0_37307266_16326.cpp: In function 'int main()':
0_0_37307266_16326.cpp:7:51: error: 'scanf_s' was not declared in this scope
  while (scanf_s("%lf%lf%lf%lf", &x1, &y1, &x2, &y2) !=EOF)
                                                   ^