View Compilation Error

0_0_18874763_22023.cpp: In function 'int main()':
0_0_18874763_22023.cpp:14:24: error: 'scanf' was not declared in this scope
     while(scanf("%d",&n)!=EOF)
                        ^
0_0_18874763_22023.cpp:14:27: error: 'EOF' was not declared in this scope
     while(scanf("%d",&n)!=EOF)
                           ^
0_0_18874763_22023.cpp:23:26: error: 'printf' was not declared in this scope
         printf("%d\n",sum);
                          ^