The following program reads the letter from A to Z and prints it's corresponding telephone digit. This program uses a sentinal controlled while loop . To stop the program user is promoted for the sentinal which is # .

 The following program reads the letter from A to Z and prints it's corresponding telephone digit. This program uses a sentinal controlled while loop . To stop the program user is promoted for the sentinal which is # .

SOURCE  CODE :-

#include <iostream> 

using namespace std; 

int main() 

{ 

char letter ;

cout << "This is a program to convert uppercase Letter from A to Z into their corresponding telephone digit " << endl ;

cout << "To stop this program enter # " << endl ;

cout << "Enter an uppercase letter : " << endl ;

cin >> letter ;

while (letter != '#' )

{

cout << "The letter you entered is " << letter << " and the corresponding telephone digit is : " << endl ;

if (letter >= 'A' && letter <= 'Z' )

{

switch (letter)

{

case 'A' :

case 'B' :

case 'C' :

cout << "2" << endl ;

break ;

case 'D' :

case 'E' :

case 'F' :

cout << "3" << endl ;

break ;

case 'G' :

case 'H' :

case 'I' :

cout << "4" << endl ;

break ;

case 'J' :

case 'K' :

case 'L' :

cout << "5" << endl ;

break ;

case 'M' :

case 'N' :

case 'O' :

cout << "6" << endl ;

break ;

case 'P' :

case 'Q' :

case 'R' :

case 'S' :

cout << "7" << endl ;

break ;

case 'T' :

case 'U' :

case 'V' :

cout << "8" << endl ;

break ;

case 'W' :

case 'X' :

case 'Y' :

case 'Z' :

cout << "9" << endl ;

break ;

}

}

else

cout << "Invalid input "<< endl ;

cout << "Enter another uppercase letter to find it's corresponding telephone digit, To stop the program please enter '#' " << endl ;

cin >> letter ;

cout << endl ;

}

return 0 ;

}

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