Answer:
Following are the program written in the C++ Programming Language:
#include <iostream> //header file
using namespace std; //using namespace
int main() //main function
{
char letters;
cout << "To stop the program enter 0" << endl;
cout << "Enter letter: " ;
cin >> letters;
//set while loop
while (letters != '0' && letters >= 'A' && letters <= 'z') {
cout << "The letter you entered: " << letters << endl;
cout << "corresponding telephone digits is: ";
if (letters > 'Z') { //if statement
letters = (int)letters-32; // letters covertion
}
switch (letters) { //switch statement
case'A':
case'B':
case'C':
cout << "2" << "\n""\n"; //print message
break; //break the statement
case'D':
case'E':
case'F':
cout << "3" << "\n""\n"; //print message
break; //break the statement
case'G':
case'H':
case'I':
cout << "4" << "\n""\n"; //print message
break; //break the statement
case'J':
case'K':
case'L':
cout << "5" <<"\n""\n"; //print message
break; //break the statement
case'M':
case'N':
case'O':
cout << "6" <<"\n""\n"; //print message
break; //break the statement
case'P':
case'Q':
case'R':
case'S':
cout << "7" << "\n""\n"; //print message
break; //break the statement
case'T':
case'U':
case'V':
cout << "8" << "\n""\n"; //print message
break; //break the statement
case'W':
case'X':
case'Y':
case'Z':
cout << "9" << "\n""\n"; //print message
break; //break the statement
default:
break; //break the statement
}
//print and return letters
cout << "Enter another letter to find out the number: ";
cin >> letters;
}
return 0;
}
<u>Output</u>:
To stop the program enter 0
Enter letter: a
The letter you entered: a
corresponding telephone digits is: 2
Enter another letter to find out the number: S
The letter you entered: S
corresponding telephone digits is: 7
Enter another letter to find out the number: 0
Explanation:
Here, we define header file "<iostream>" and namespace "std" then, we define main() function.
- Then, inside the main function we set character data type variable "letters" and then print message and get input from the user in the variable "letters".
- Then, we set the while loop and pass the condition then, we set the if statement and print two message.
- Then, we set the switch statement inside the while loop and pass the letter variable in it's parameter then, we set the following cases of the switch statement.
- Finally, we print the message and print the value of the variable "letters" then, return 0 and close the main() function.
