using System;
class DigitFinder
{
/// <summary>
/// Finds the digit that comes after the target digit when scanning from right to left.
/// </summary>
/// <param name="number">The number to search within.</param>
/// <param name="target">The digit to find.</param>
/// <returns>The digit that comes after the target, or -1 if not found or no next digit.</returns>
public static int FindNextDigit(int number, int target) {
int next = -1;
while (number > 0) {
int current = number % 10;
number /= 10;
if (current == target) {
return next;
}
next = current;
}
return -1;
}
static void Main()
{
int number = 8902741;
int target = 2;
int result = FindNextDigit(number, target);
if (result != -1) {
Console.WriteLine($"The digit after {target} in {number} is {result}.");
}
else {
Console.WriteLine($"The digit {target} is not found or has no next digit in {number}.");
}
}
}
/*
run:
The digit after 2 in 8902741 is 7.
*/
