View Compilation Error

0_0_25389713_24423.cpp: In function 'int main()':
0_0_25389713_24423.cpp:7:50: error: 'scanf_s' was not declared in this scope
  while (scanf_s("%d %d %d %d", &x1, &y1, &x2, &y2)!=EOF)
                                                  ^
0_0_25389713_24423.cpp:10:20: error: expected '}' at end of input
   printf("%.2f", m);
                    ^
0_0_25389713_24423.cpp:10:20: error: expected '}' at end of input