View Compilation Error

0_0_19979454_4946.cpp:1:9: error: #include expects "FILENAME" or <FILENAME>
 #include
         ^
0_0_19979454_4946.cpp: In function 'int main()':
0_0_19979454_4946.cpp:5:25: error: 'scanf' was not declared in this scope
 while(scanf("%d%d",&a,&b)) //一直读取知道输入EOF
                         ^
0_0_19979454_4946.cpp:6:19: error: 'printf' was not declared in this scope
 printf("%d\n", a+b);
                   ^