View Compilation Error

0_0_37281300_5110.cpp: In function 'int main()':
0_0_37281300_5110.cpp:4:23: error: 'scanf' was not declared in this scope
  while (scanf("%d", &n) != EOF) 
                       ^
0_0_37281300_5110.cpp:4:28: error: 'EOF' was not declared in this scope
  while (scanf("%d", &n) != EOF) 
                            ^
0_0_37281300_5110.cpp:11:23: error: 'printf' was not declared in this scope
   printf("%d\n", total);
                       ^