Write the C++ program so that it processes both uppercase and lowercase letters and outputs the corresponding telephone digit. If the input is something other than an uppercase or lowercase letter, the program must output an appropriate error message. Hint: If-else statements and type casting are involved. No switch structure should be involved. Please use the below program to only add not delete the program.    //User enters a letter (capital or lowercase) //Program should write out whether that letter is //a telephone digit or invalid input #include using namespace std; int main() {     //Declare variables     char letter;     int digit;     int numc, num1;     //Prompt the user and reads in values.     cout << "To stop the program press #." << endl;     cout << "Enter a letter: ";     cin >> letter;     while (letter != '#')     {         cout << "Letter: " << letter << ", Corresponding telephone"             << " digit: ";                  numc = static_cast(letter) - static_cast('A');         num1 = static_cast(letter) - static_cast('a');         if (0 <= numc && numc < 26)         {             digit = numc / 3 + 2;             if ((numc / 3 == 6 || numc / 3 == 7) && (numc % 3 == 0))                 digit = digit - 1;             if (digit > 9)                 digit = 9;             cout << digit << endl;

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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Write the C++ program so that it processes both uppercase and lowercase letters and outputs the corresponding telephone digit. If the input is something other than an uppercase or lowercase letter, the program must output an appropriate error message. Hint: If-else statements and type casting are involved. No switch structure should be involved. Please use the below program to only add not delete the program. 
 

//User enters a letter (capital or lowercase)
//Program should write out whether that letter is
//a telephone digit or invalid input

#include <iostream>
using namespace std;

int main()
{
    //Declare variables
    char letter;
    int digit;
    int numc, num1;

    //Prompt the user and reads in values.
    cout << "To stop the program press #." << endl;

    cout << "Enter a letter: ";
    cin >> letter;

    while (letter != '#')
    {
        cout << "Letter: " << letter << ", Corresponding telephone"
            << " digit: ";
        
        numc = static_cast<int>(letter) - static_cast<int>('A');
        num1 = static_cast<int>(letter) - static_cast<int>('a');

        if (0 <= numc && numc < 26)
        {
            digit = numc / 3 + 2;

            if ((numc / 3 == 6 || numc / 3 == 7) && (numc % 3 == 0))
                digit = digit - 1;

            if (digit > 9)
                digit = 9;

            cout << digit << endl; 

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