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Please help with "loops"

jsbd29 (16)
I need to create a C++ program that the user type letter and the program convert the letter into a telephone number including the hyphen.
Can anyone show me how to cast uppercase and lowercase alphabet letters to covert in number ( like the Get-loan will convert in some number )
It has to be short without case A, Case B... I think I gotta use static_cast to do that but i don't know how. Please help!!!

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#include <iostream>
#include <string>
using namespace std;
int main()
{
    char startProgram;

    while(true) // This while(run = true) is incorrect, it will always be true, change to while(run) or while(true)
    {
        cout <<"\nEnter Y or y to convert phone number from letters to numbers \n(enter any other letter to quit)"<<endl;
        cin >> startProgram;

		cin.ignore(10000,'\n');

        if(startProgram=='Y'|| startProgram=='y')
        {
            cout << "\nEnter the letters you would like your phone number to represent: "<<endl;
         
			getline(cin, letters);

            cout << "\nThe corresponding number is: ";

			// No need for these operations:
            //length = letters;
            //maxLength = length.length();


			// This doesnt make sense:
			//if(maxLength > 8)
            //{
                //maxLength = 7;
            //}

			for(unsigned int i=0; i <= 7 ; i++) // You could just set it to <= 7 or < 8
			// There is a function from the string class that gives you the size letters.length()
            {
				// Put this if BEFORE the switch statement, if its AFTER, 
				// it will first do the operations on the switch and then check
			
                if(i==3)
                    cout<<'-';  // If you are only outputting a single character use single quotes

                switch(letters[i])
                {
                case 'A':
                case 'a':
                case 'B':
                case 'b':
                case 'C':
                case 'c':
                    cout << 2;
                    break;
                case 'D':
                case 'd':
                case 'E':
                case 'e':
                case 'F':
                case 'f':
                    cout << 3;
                    break;
                case 'G':
                case 'g':
                case 'H':
                case 'h':
                case 'I':
                case 'i':
                    cout << 4;
                    break;
                case 'J':
                case 'j':
                case 'K':
                case 'k':
                case 'L':
                case 'l':
                    cout << 5;
                    break;
                case 'M':
                case 'm':
                case 'N':
                case 'n':
                case 'O':
                case 'o':
                    cout << 6;
                    break;
                case 'P':
                case 'p':
                case 'Q':
                case 'q':
                case 'R':
                case 'r':
                case 'S':
                case 's':
                    cout << 7;
                    break;
                case 'T':
                case 't':
                case 'U':
                case 'u':
                case 'V':
                case 'v':
                    cout << 8;
                    break;
                case 'W':
                case 'w':
                case 'X':
                case 'x':
                case 'Y':
                case 'y':
                case 'Z':
                case 'z':
                    cout << 9;
                    break;

				// I need to remove all these cases and make one short program: '
                //case ' ':
                    //cout << " ";
                default:
					// Just do a break here
                    //cout <<"Now quitting..."<<endl;
                    break;
                }
			
            }
        }
        else 
			break;
    }
	cout << "Now quitting..." << endl;
    //system("pause");
    return 0;
}
Last edited on
goldenchicken (160)
First of all, you can use std::tolower to convert all letters to lowercase. Then, you can get the value you want in the following way:
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int convert (char c)
{
        return (static_cast <int>(std::tolower (c)) - static_cast <int>('a')) / 3 + 1;
}
jsbd29 (16)
thanks! I am trying it out without much success :(
Last edited on
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