View Compilation Error

0_0_38517314_4882.cpp: In function 'void isprime(int)':
0_0_38517314_4882.cpp:11:22: error: 'printf' was not declared in this scope
  printf("%d：YES\n",a);
                      ^
0_0_38517314_4882.cpp:13:21: error: 'printf' was not declared in this scope
  printf("%d；NO\n",a);
                     ^
0_0_38517314_4882.cpp: In function 'int main()':
0_0_38517314_4882.cpp:20:15: error: 'scanf' was not declared in this scope
  scanf("%d",&i); 
               ^