View Compilation Error

0_0_18647874_12076.cpp: In function 'int main()':
0_0_18647874_12076.cpp:4:21: error: 'scanf' was not declared in this scope
  while(scanf("%d",&N)!=EOF)
                     ^
0_0_18647874_12076.cpp:4:24: error: 'EOF' was not declared in this scope
  while(scanf("%d",&N)!=EOF)
                        ^
0_0_18647874_12076.cpp:9:15: error: 'printf' was not declared in this scope
  printf("%d",s);} }
               ^