HELP

[sonhadorPR@gmail.com]

How do I write the quadratic equation in C++?
Thank You!
SonhadorPR

[osmium]

Re: HELP

<sonhadorPR@gma il.comwrote:

How do I write the quadratic equation in C++?

The same way you write any other equation in C++. Do the algebra with
pencil and paper (if necessary) and type in the equation following the rules
of the language.

[red floyd]

Re: HELP

sonhadorPR@gmai l.com wrote:

How do I write the quadratic equation in C++?
Thank You!
SonhadorPR
>

Send me your instructor's email address, and I'll send it directly to him.

[Jim Langston]

Re: HELP

<sonhadorPR@gma il.comwrote in message
news:1156735467 .326839.112140@ p79g2000cwp.goo glegroups.com.. .

How do I write the quadratic equation in C++?
Thank You!
SonhadorPR

Quadradic Equation is
ax^2 + bx + c = 0 (where ^2 is squared).

For x this becomes:

-b +/- Sqrt( b^2 - 4ac )
x = ------------------------
2a

Which is known as the Quadratic Formula.

In C or C++ langauge terms this is:
x = (-b + sqrt( b*b - 4 * a * c ) ) / 2 * a;
x = (-b - sqrt( b*b - 4 * a * c ) ) / 2 * a;

(Yes, there are two possible answers.

[Greg]

Re: HELP


Jim Langston wrote:

<sonhadorPR@gma il.comwrote in message
news:1156735467 .326839.112140@ p79g2000cwp.goo glegroups.com.. .

How do I write the quadratic equation in C++?
Thank You!
SonhadorPR

>
Quadradic Equation is
ax^2 + bx + c = 0 (where ^2 is squared).
>
For x this becomes:
>
-b +/- Sqrt( b^2 - 4ac )
x = ------------------------
2a
>
Which is known as the Quadratic Formula.
>
In C or C++ langauge terms this is:
x = (-b + sqrt( b*b - 4 * a * c ) ) / 2 * a;
x = (-b - sqrt( b*b - 4 * a * c ) ) / 2 * a;
>
(Yes, there are two possible answers.

More precisely: there are at most two solutions to the equation.
Depending on the inputs, there may be two, one or no solutions for a
particular equation. The somewhat tricky part is to make sure that the
program can handle all three of these outcomes.

Greg

[Jim Langston]

Re: HELP


"Greg" <greghe@pacbell .netwrote in message
news:1156740277 .976827.220010@ p79g2000cwp.goo glegroups.com.. .

>
Jim Langston wrote:

><sonhadorPR@gm ail.comwrote in message
>news:115673546 7.326839.112140 @p79g2000cwp.go oglegroups.com. ..

How do I write the quadratic equation in C++?
Thank You!
SonhadorPR

>>
>Quadradic Equation is
>ax^2 + bx + c = 0 (where ^2 is squared).
>>
>For x this becomes:
>>
> -b +/- Sqrt( b^2 - 4ac )
>x = ------------------------
> 2a
>>
>Which is known as the Quadratic Formula.
>>
>In C or C++ langauge terms this is:
>x = (-b + sqrt( b*b - 4 * a * c ) ) / 2 * a;
>x = (-b - sqrt( b*b - 4 * a * c ) ) / 2 * a;
>>
>(Yes, there are two possible answers.

>
More precisely: there are at most two solutions to the equation.
Depending on the inputs, there may be two, one or no solutions for a
particular equation. The somewhat tricky part is to make sure that the
program can handle all three of these outcomes.
>
Greg

True. a == 0.0 would cause problems.

[Howard]

Re: HELP


"Jim Langston" <tazmaster@rock etmail.comwrote in message news:aAtIg.33

>
In C or C++ langauge terms this is:
x = (-b + sqrt( b*b - 4 * a * c ) ) / 2 * a;
x = (-b - sqrt( b*b - 4 * a * c ) ) / 2 * a;
>

Don't you need parentheses there, around the "2 * a" part? Division and
multiplication have the same precedence, so as written, the above would
divide by 2, then multiply by a, instead of dividing by (2 * a), right?

-Howard

[Frederick Gotham]

Re: HELP

Howard posted:

>
"Jim Langston" <tazmaster@rock etmail.comwrote in message news:aAtIg.33

>>
>In C or C++ langauge terms this is:
>x = (-b + sqrt( b*b - 4 * a * c ) ) / 2 * a;
>x = (-b - sqrt( b*b - 4 * a * c ) ) / 2 * a;
>>

>
Don't you need parentheses there, around the "2 * a" part? Division and
multiplication have the same precedence, so as written, the above would
divide by 2, then multiply by a, instead of dividing by (2 * a), right?

Yes Howard, you're correct.

The formulae should be:

(-b + sqrt(b*b - 4*a*c)) / (2*a);
(-b - sqrt(b*b - 4*a*c)) / (2*a);

--

Frederick Gotham