View Compilation Error

0_0_34163830_31447.cpp: In function 'int main()':
0_0_34163830_31447.cpp:6:16: error: 'scanf' was not declared in this scope
   scanf("%d",&n);
                ^
0_0_34163830_31447.cpp:29:26: error: 'printf' was not declared in this scope
        printf("%d\n",k*10);
                          ^
0_0_34163830_31447.cpp: At global scope:
0_0_34163830_31447.cpp:33:2: error: expected unqualified-id before '<' token
 }</span>
  ^