View Compilation Error

0_0_19215787_12371.cpp: In function 'int main()':
0_0_19215787_12371.cpp:6:21: error: 'scanf' was not declared in this scope
  while(scanf("%d",&n)!=EOF)
                     ^
0_0_19215787_12371.cpp:6:24: error: 'EOF' was not declared in this scope
  while(scanf("%d",&n)!=EOF)
                        ^
0_0_19215787_12371.cpp:16:20: error: 'printf' was not declared in this scope
   printf("%d\n",ant);
                    ^