imaginary number in c++

Replies

• 

  vinci

  
  try this equation. let me know if it doesnt work still
• 

  silverscorpion

  Use a variable to indicate whether the delta (B[sup]2[/sup]-4AC) is positive or negative.
  
  Instead of
  pro = sqrt((b*b)-(4*a*c));
  
  here, use
  pro = sqrt(abs(B*B)-(4*A*C))
  
  And then, if delta is positive, use it as is. If delta is negative, just print an 'i' or 'j' along with the result, to indicate that the root is imaginary...
• 

  maria flor

  vinci

  
  try this equation. let me know if it doesnt work still

  it doesn't work
• 

  maria flor

  silverscorpion

  Use a variable to indicate whether the delta (B[sup]2[/sup]-4AC) is positive or negative.
  
  Instead of
  pro = sqrt((b*b)-(4*a*c));
  
  here, use
  pro = sqrt(abs(B*B)-(4*A*C))
  
  And then, if delta is positive, use it as is. If delta is negative, just print an 'i' or 'j' along with the result, to indicate that the root is imaginary...

  i just tried it but when i try to input an equation with imaginary roots.. it doesn't give me an answer...
• 

  maria flor

  silverscorpion

  Use a variable to indicate whether the delta (B[sup]2[/sup]-4AC) is positive or negative.
  
  Instead of
  pro = sqrt((b*b)-(4*a*c));
  
  here, use
  pro = sqrt(abs(B*B)-(4*A*C))
  
  And then, if delta is positive, use it as is. If delta is negative, just print an 'i' or 'j' along with the result, to indicate that the root is imaginary...

  thanks for that but when i try to input an equation with imaginary roots.. it still doesn't give an answer...
• 

  silverscorpion

  After you have calculated delta, (variable "pro" in your program), calculate the individual roots in the following way..
  
  

  pro = sqrt(abs(B*B-4*A*C))
   
  if ((B*B-4*A*C) >= 0) {
      x1 = (-B+pro)/2*A
      x2 = (-B-pro)/2*A
      cout << "The first root is " << x1 << endl
      cout << "The second root is " << x2 << endl
  } else {
      real = -B/2*A
      imag = pro/2*A
      cout << "The first root is "<Try using this..
                                      

• 

  vinci

  you need value of of a,b,c ?i found that equation i posted here gives complex roots .
• 

  maria flor

  silverscorpion

  After you have calculated delta, (variable "pro" in your program), calculate the individual roots in the following way..
  
  

  pro = sqrt(abs(B*B-4*A*C))
   
  if ((B*B-4*A*C) >= 0) {
      x1 = (-B+pro)/2*A
      x2 = (-B-pro)/2*A
      cout << "The first root is " << x1 << endl
      cout << "The second root is " << x2 << endl
  } else {
      real = -B/2*A
      imag = pro/2*A
      cout << "The first root is "<Try using this..

  it still don't work... when i try to run it and input values with imaginary roots it suddenly return...
• 

  silverscorpion

  What is the input you are giving and what is the output?
  
  Give the full dump..
• 

  maria flor

  here: when i input those numbers...it returns without giving any roots...