View Compilation Error

0_0_27205562_29994.cpp:1:1: error: 'include' does not name a type
 include <iostream>
 ^
0_0_27205562_29994.cpp: In function 'int main()':
0_0_27205562_29994.cpp:6:26: error: 'scanf' was not declared in this scope
 while(~scanf("%d%d",&a,&b)) printf("%d\n",a+b);
                          ^
0_0_27205562_29994.cpp:6:46: error: 'printf' was not declared in this scope
 while(~scanf("%d%d",&a,&b)) printf("%d\n",a+b);
                                              ^