Digit-increasing number test

Question

A number is called digit-increasing if it is equal n + nn + nnn + ... for some digit n between 1 and 9. For example 24 is digit-increasing because it equals 2 + 22 (here n = 2).

Actually, a friend of mine asked me this question and i am stuck thinking about it but couldn't find the exact solution so far. Can anyone help ? I needed the function that returns true if it is digit-increasing else false.

Answer 1

I have done in this way. Check out once.

int sum = 0, count =0;
bool flag = false;

public bool isDigitIncreasing(int input_number)
{
int  n= get_number_of_digit(input_number); // Gets number of digits
int sum = 0;
    for(int i=0;i<n;i++)
    {
        sum = sum*10+1;
        count = count + sum;
    }

    for(int i=1; i<=9;i++)
    {
        if((input_number)==count*i)
        {
            flag = true;
            break;
        }
        else
        flag = false;
    }
    return flag;

}

    public int get_number_of_digit(int num)
    {

        int size = 0;
        do
        {
            num = num/10;
            size++;
        }while(num>0);
        return size;
    }