View Compilation Error

0_0_26558024_22406.cpp:1:10: error: #include expects "FILENAME" or <FILENAME>
 #include 
          ^
0_0_26558024_22406.cpp: In function 'int main()':
0_0_26558024_22406.cpp:5:19: error: 'scanf' was not declared in this scope
 scanf("%d%d",&a,&b); 
                   ^
0_0_26558024_22406.cpp:6:1: error: 'sum' was not declared in this scope
 sum=a+b; 
 ^
0_0_26558024_22406.cpp:7:16: error: 'printf' was not declared in this scope
 printf("%d",sum); 
                ^