View Compilation Error

0_0_30634047_707.cpp: In function 'int main()':
0_0_30634047_707.cpp:6:18: error: 'scanf' was not declared in this scope
     scanf("%d",&n);
                  ^
0_0_30634047_707.cpp:12:26: error: 'printf' was not declared in this scope
     printf("sum=%d\n",sum);
                          ^