3.5 Solutions

if (temperature > maxTemp)
   println("Porridge too hot");
else if (temperature < minTemp)
   println("Porridge too cold");
else
   println("Porridge just right!");

1. There will not be any output since the first if statement does not have an else
2.  

   Reject

if (a < b && a < c)
  println(a);
else if (b < c)
  println(b);
else
  println(c);

if (item < 0)
  negativeSum += item;
else if (item > 0)
  positiveSum += item;
else
  zeroCount++;

if (year % 100 == 0 && year %  400 != 0)
    leapYear = false;
else if (year % 100 == 0)
    leapYear = true;
else if (year %  4 == 0)
    leapYear = true;
else
    leapYear = false;