imaginary number in c++

@maria-flor-8cAkif • Oct 23, 2024

Oct 23, 2024

1.8K

could someone help me on what to input on C++ so that i can get the imaginary roots of a quadratic equation....
I really don't know what to do...😭
help me please..😕😕😭
thank you!!

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vinci

@vinci-e4PtMU • Feb 25, 2012

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

@silverscorpion-iJKtdQ • Feb 25, 2012

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...
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maria flor

@maria-flor-8cAkif • Feb 25, 2012

vinci

try this equation. let me know if it doesnt work still
it doesn't work
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maria flor

@maria-flor-8cAkif • Feb 25, 2012

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...
0
maria flor

@maria-flor-8cAkif • Feb 25, 2012

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...
0

silverscorpion

@silverscorpion-iJKtdQ • Feb 25, 2012

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 "<<real<<"+i"<<imag<<endl
    cout << "The first root is "<<real<<"-i"<<imag<<endl
}

Try using this..

vinci

@vinci-e4PtMU • Feb 25, 2012

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

@maria-flor-8cAkif • Feb 25, 2012

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 "<<real<<"+i"<<imag<<endl
    cout << "The first root is "<<real<<"-i"<<imag<<endl
}

Try using this..

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

silverscorpion

@silverscorpion-iJKtdQ • Feb 25, 2012

What is the input you are giving and what is the output?

Give the full dump..
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maria flor

@maria-flor-8cAkif • Feb 26, 2012

here: when i input those numbers...it returns without giving any roots...
0