public class DigitFinder {
/**
* Finds the digit that comes before the target digit when scanning from right to left.
*/
public static int findPreviousDigit(int number, int target) {
while (number > 0) {
int current = number % 10;
number /= 10;
if (current == target) {
if (number != 0) {
return number % 10;
}
}
}
return -1;
}
public static void main(String[] args) {
int number = 8902741;
int target = 7;
int result = findPreviousDigit(number, target);
if (result != -1) {
System.out.printf("The digit before %d in %d is %d.%n", target, number, result);
} else {
System.out.printf("The digit %d is not found or has no previous digit in %d.%n", target, number);
}
}
}
/*
run:
The digit before 7 in 8902741 is 2.
*/
