Increasing numbers P35537

In this exercise, we say that a natural number is increasing if every digit is less than or equal to the digit which is on its right (if any).

Write a recursive function that tells if a natural number @n@ is increasing or not.

Interface

bool is_increasing(int n);

int is_increasing(int n);

public static boolean isIncreasing(int n);

is_increasing(n)  # returns bool

is_increasing(n: int) -> bool

Observation

You only need to submit the required procedure; your main program will be ignored.