4.2 Solutions

  1. Use a do if the loop body must be executed at least once.

  2.  
    How many items are to be added?
Give a positive value
Give a positive value

  3.  
    void setup()
{
   char answer;
   do
   {
      answer = getChar("Continue? Respond with y or n");
   } while (answer != 'y' && answer != 'n');
}

  4.  
    void setup()
{
   char response;
   do
   {
      response = getChar("Please enter a letter of the alphabet");
   } while ((response < 'a' || response > 'z') && (response < 'A' || response > 'Z'));
}
  5.   
    void setup()
{
  int num;
 
  do
  {
    num = getInt("Enter a positive integer");
  } while (num <= 0);
  
  int temp = num, sum = 0;
  do
  {
    sum += temp %10;
    temp /= 10;
  } while (temp > 0);
  
  println("The sum of the digits in " + num + " is " + sum);   
}