5.4 Solutions

  1. A few examples:
    println();   println("A string");    println("two", "strings");
abs(10)  // returns an int
abs(-1.5)  // returns a float
fill(255);   fill(0, 0, 255);     fill(0, 255, 0, 255);
    1. B - a perfect match for the parameters
    2. invalid - first argument must fit in an int (both methods would require casting for a long first argument)
    3. B - the least amount of widening - only first argument needs to be widened to an int
    4. invalid - second argument must fit in an int or a long (both methods would require casting for a float second argument)
    5. A - a perfect match for the parmeters (also couldn't work for B)
    6. B - less widening required (2 char to 2 int - method A would require one of the casts to a long which requires more widening)

  3.  
    void rollDie (int rolls)
{
  if (rolls < 1)
    println("Invalid argument - rolls must be at least 1");
  for (int i = 1; i <= rolls; i++)
     println((int)random(1, 7));
}

void rollDie (int rolls, int faces)
{
  if (rolls < 1)
    println("Invalid argument - rolls must be at least 1");
  if (faces < 4)
    println("Invalid argument - faces must be at leat 4");
  else
    for (int i = 1; i <= rolls; i++)
      println((int)random(1, faces+1));
}

  4.  
    int average(long a, long b)
{
  return (int)((a + b) / 2);
}

float average(float a, float b)
{
  return (a + b) / 2;
}

void setup()
{
  int m = average(8, 7L);
  float x = average(2.0, 3);
  println(m);
  println(x);
}