View Compilation Error

0_0_30794618_3423.cpp: In function 'int main()':
0_0_30794618_3423.cpp:4:15: error: 'scanf' was not declared in this scope
  scanf("%d",&m);
               ^
0_0_30794618_3423.cpp:8:24: error: 'EOF' was not declared in this scope
  while(scanf("%d",&n)!=EOF)
                        ^
0_0_30794618_3423.cpp:20:22: error: 'printf' was not declared in this scope
   printf("%d\n\n",sum);
                      ^