View Compilation Error

0_0_26723601_21955.cpp:1:9: error: #include expects "FILENAME" or <FILENAME>
 #include
         ^
0_0_26723601_21955.cpp: In function 'int main()':
0_0_26723601_21955.cpp:5:30: error: 'scanf' was not declared in this scope
    while(scanf("%d%d", &i, &j) == 2)
                              ^
0_0_26723601_21955.cpp:6:24: error: 'printf' was not declared in this scope
    printf("%d\n", i + j);
                        ^