a = Complex(1, 1)       
i = Complex::I          
b = 3.14159 + 1.25 * i
c = '1/2+3/4i'.to_c     
c =  1.0/2+3/4i         


puts a + b              
puts a * b              
puts -a                 
puts 1.quo a            
puts a.conjugate        
puts a.conj