Trying to write this program in C++, if you read the attachments, I am just star

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Trying to write this program in C++, if you read the attachments, I am just starting to learn about loops (for, while, etc.) and if/else statements. I'd really appreciate if someone can show me a program for this in C++ that is not too far above my understanding of C++. The instructions don't seem clear to what I really need, rather than prompting the user to input numbers to run the program, the software I am running on to grade this program does it. So there isn't any need for "cout<<"Enter your Integer: " " etc...

INSTRUCTIONS

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I am looking for a program I can use to relate back to and to compare to mine and to figure out the problems I am encountering. This is my 3rd time asking for help as the last two responses programs gave outputs that ran for an infinite loop and were wrong, but I am unsure how to fix them.

The aim of this assignment is practice the use of while loops and conditionals statements. You are going to write a program that prompts the user for an integer and then determines the additive persistence and corresponding additive root. You will continue prompting the user for an integer until they enter a negative number which indicates they are finished

Explanation / Answer

#include<iostream>
using namespace std;
int main(){
  
long n,ncopy;
cin >> n;
// run the program untill user input < 1
while(n>0){
  
int additive_persistance=0,additive_root,sum=0;
ncopy = n;
additive_root = n;
  
// add digits
while(ncopy>9){
sum = 0;
while(ncopy>0){
sum += ncopy%10;
ncopy /= 10;
}
  
//increment Persistance value
additive_persistance+=1;
  
//set additive_root value
additive_root = sum;
  
// copy sum value to ncopy to reiterate
ncopy = sum;
}
  
//print output values
cout << "Additive Root : " << additive_root << endl;
cout << "Additive Persistance : " << additive_persistance << endl;
  
// get user input
cin >> n;
}
cout << "Error" << endl;
return 0;
}

/*
sample output

1234
Additive Root       :   1
Additive Persistance   :   2
123
Additive Root       :   6
Additive Persistance   :   1
12
Additive Root       :   3
Additive Persistance   :   1
1
Additive Root       :   1
Additive Persistance   :   0
-1
Error
*/

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