以下是我的二次计算器的代码:
puts "A?"
a = gets.to_f
puts "B?"
b = gets.to_f
puts "C?"
c = gets.to_f
d = (-b + (((b**2) - (4*a*c))**(1/2)))/(2*a)
puts d
f = (-b - (((b**2) - (4*a*c))**(1/2)))/(2*a)
puts f
然而,答案并不总是正确的。
例如,我没有想象中的数字。
我做错了什么?
答案 0 :(得分:1)
您正在使用实数进行所有计算。你需要require 'complex'
获得复杂的数字。我保留了你的程序结构
并为其添加了复数。
另外一件事,在你的程序中你有1/2但由于这些是整数,这个除法导致0,因为整数除法抛弃了小数结果(例如,7/2是3)。
#!/usr/bin/ruby
require 'complex'
# very small real number, consider anything smaller than this to
# be zero
EPSILON = 1e-12
def print_complex(n)
# break n into real and imaginary parts
real = n.real
imag = n.imag
# convert really small numbers to zero
real = 0.0 if real.abs < EPSILON
imag = 0.0 if imag.abs < EPSILON
# if the imaginary part is zero, print as a real
if n.imag == 0.0
puts real
else
puts Complex(real, imag)
end
end
puts "A?"
a = gets.to_f
puts "B?"
b = gets.to_f
puts "C?"
c = gets.to_f
# Turn the real numbers into complex numbers
ac = Complex(a, 0)
bc = Complex(b, 0)
cc = Complex(c, 0)
dc = (-bc + (((bc**2) - (4*ac*cc))**(1.0/2)))/(2*ac)
print_complex(dc)
fc = (-bc - (((bc**2) - (4*ac*cc))**(1.0/2)))/(2*ac)
print_complex(fc)