View Compilation Error

0_0_16137938_19321.cpp:1:10: error: #include expects "FILENAME" or <FILENAME>
 #include 
          ^
0_0_16137938_19321.cpp: In function 'int main()':
0_0_16137938_19321.cpp:5:32: error: 'scanf' was not declared in this scope
      while(scanf("%d %d",&a, &b)==2);
                                ^
0_0_16137938_19321.cpp:6:23: error: 'printf' was not declared in this scope
      printf("%d\n",a+b);
                       ^