View Compilation Error

0_0_36317744_2161.cpp: In function 'int main()':
0_0_36317744_2161.cpp:6:15: error: 'scanf' was not declared in this scope
  scanf("%d",&t);
               ^
0_0_36317744_2161.cpp:17:31: error: 'printf' was not declared in this scope
   printf("%d\n",ans%1000000007);
                               ^