4.5 Solutions

  1. The println is not in the loop because of the semi-colon. It only gets executed once. 
    100 10000
    1. Any value
    2. No value
    1. Endless loop
    2. Change the || to an &&

  4. It will be an endless loop because of the semi-colon after the while
    1.  
      0
1
4
9
16
25
    2.  
      4
5
6
7
8
    3.  
      25
21
17
13
9
5
1
    4.  
      1
2
6
24
    1. Sum of the integers from 0 to 10
    2. Number of factors of 2 in n
    3. Sum of the digits in n
  7.  
    void setup()
{
  int n = getInt("Enter a number to test for prime");
  boolean isPrime = true;
  for (int i = 2; i < n && isPrime; i++)
    if (n % i == 0)
      isPrime= false;
  if (isPrime)
    println(n + " is a prime number.");
  else
    println(n + " is NOT a prime number.");
}
  8.  
    void setup()
{
  int n = getInt("Please enter a natural integer");
  println("Divisors of " + n + " are:");
  for (int i = 1; i <= n; i++)
    if (n % i == 0)
      print(i + " ");
  println();
}
  1.  
    void setup()
{
  int n = getInt("Please enter a positive integer");
  while (n > 0)
  {
    println(n % 10);
    n /= 10;
  }
}
  2.  
    void setup()
{
  int n = getInt("Please enter a positive integer");
  int temp = n;
  int numDigits = 0;
  while (temp > 0)
  {
    numDigits++;
    temp /= 10;
  }
  for (int i = numDigits; i > 0; i--)
  {
    println(n/(int)Math.pow(10,i-1));
    n %= (int) (Math.pow(10,i-1));
  }
}
  3.  
    3
21
43
215
43
21
  4.  
    3456
234
12