View Compilation Error

0_0_37440610_5505.cpp: In function 'int main()':
0_0_37440610_5505.cpp:42:19: error: 'n1' was not declared in this scope
  printf("%.0lf\n",n1[M]*fac[M]);
                   ^
0_0_37440610_5505.cpp:42:25: error: 'fac' was not declared in this scope
  printf("%.0lf\n",n1[M]*fac[M]);
                         ^