# quadeval.rb – A simple Ruby program
#  Input: Four numbers, representing the values of 
#         a, b, c, and x
# Output: The value of the expression 
#          a*x**2 + b*x + c
# Get input
puts "Please input the value of a "
a = gets.to_i
puts "Please input the value of b "
b = gets.to_i
puts "Please input the value of c "
c = gets.to_i
puts "Please input the value of x "
x = gets/to_i
# Compute and display the result
result = a * x ** 2 + b * x + c
puts "The value of the expression is: #{result}"

}