View Compilation Error

0_0_31088565_25546.cpp:1:11: error: #include expects "FILENAME" or <FILENAME>
 # include 
           ^
0_0_31088565_25546.cpp: In function 'int main()':
0_0_31088565_25546.cpp:5:26: error: 'scanf' was not declared in this scope
 while (scanf("%d%d",&a,&b) != EOF)
                          ^
0_0_31088565_25546.cpp:5:31: error: 'EOF' was not declared in this scope
 while (scanf("%d%d",&a,&b) != EOF)
                               ^
0_0_31088565_25546.cpp:8:18: error: 'printf' was not declared in this scope
 printf("%d\n",sum);
                  ^