i need help with this question

Question

write a program that will check how many numbers from 1 to N(inclusive) satisfy the condition that the sum of their digits be equal to 17

Answer 1

#include <stdio.h>

int main()
{
int a,sum,i,j,n;
do{
printf("n must be >=89 \nn=") ;    //because 89 is the smallest number that satisfy the condition...
scanf("%d",&n);
}
while(n<89);

    for(i=89;i<n;i++)        
    {
        j=i;
    while(j)
        {
          sum+=j%10;
          j/=10;
        }
    if(sum==17)
       a++;
    sum=0;
    }
printf("There is %d numbers that satisfy the condition.",a);

    return 0;
}

Answer 2

#include <cstdio>
#include <cstdlib>
#include <iostream>

using namespace std;

int sumDigits(int n)
{
    if (n < 10)
    {
        return n;
    }

    return (n % 10) + sumDigits(n / 10);
}

int main()
{
    int n;
    cout << "N = ";
    cin >> n;
    
    int count = 0;
    for (int index = 1; index <= n; index++)
    {
        if (sumDigits(index) == 17)
        {
            cout << index << endl;
            count++;
        }
    }
    cout << "Count: " << count;

    return 0;
}