1. C# program to reverse a number.
2. Iterative Letter Combinations of a Phone Number.
Given an integer array containing digits from [0, 9], the task is to print all possible letter combinations that the numbers could represent.

A mapping of digit to letters (just like on the telephone buttons) is being followed. Note that 0 and 1 do not map to any letters. All the mapping are shown in the image below:

Example:

Input: arr[] = {2, 3}
Output: ad ae af bd be bf cd ce cf

Question

1. C# program to reverse a number. 
2. Iterative Letter Combinations of a Phone Number.
Given an integer array containing digits from [0, 9], the task is to print all possible letter combinations that the numbers could represent.

A mapping of digit to letters (just like on the telephone buttons) is being followed. Note that 0 and 1 do not map to any letters. All the mapping are shown in the image below:

Example:

Input: arr[] = {2, 3} 
    Output: ad ae af bd be bf cd ce cf

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