Whats wrong. Error shows no such file or directory

Question

Building a program to check whether a number is Newton number or not
https://code.sololearn.com/cI7WQ0CNMTAo/?ref=app

Answer 1

Program's logic is not correct, but besides that you have 4 errors:

1. Should be <iostream>
2. add std:: before all "cin"s and "cout"s or add a line "using namespace std;"
3. forgot a ";" after "getch"
4. int main(), not void main()

Answer 2

current standard only using iostream, not iostream.h

Answer 3

Luk thank-you, it worked, and I corrected the formula too..!