//
// simplified grade calculations program
// prompt for some grades
// print percentage and letter grade
//
println("enter exam1 grade:")
val exam1 = readInt

println("enter exam2 grade:")
val exam2 = readInt

println("enter homework grade:")
val homework = readInt

val percentage = (exam1 + exam2 + homework).toDouble / (100 + 200 + 400)

println("percentage is " + percentage)

if (percentage >= .90) 
  println("A")
else if (percentage >= .80)
  println("B")
else 
  println("less than B")