View Compilation Error

0_0_33570355_768.cpp: In function 'int main()':
0_0_33570355_768.cpp:6:28: error: 'scanf_s' was not declared in this scope
  while(scanf_s("%d%d",&m,&n)!=EOF)
                            ^
0_0_33570355_768.cpp:36:23: error: 'i' was not declared in this scope
   printf("%.2f\n", tx[i]);
                       ^