package main
import (
"fmt"
)
// FindNextDigit returns the digit that comes after the target digit
// when scanning the number from right to left.
// If the target is not found or has no next digit, it returns -1.
func FindNextDigit(number, target int) int {
next := -1
for number > 0 {
current := number % 10
number /= 10
if current == target {
return next
}
next = current
}
return -1
}
func main() {
number := 8902741
target := 2
result := FindNextDigit(number, target)
if result != -1 {
fmt.Printf("The digit after %d in %d is %d.\n", target, number, result)
} else {
fmt.Printf("The digit %d is not found or has no next digit in %d.\n", target, number)
}
}
/*
run:
The digit after 2 in 8902741 is 7.
*/
