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sundog
Posts: **3**Member

Can someone help me to write a program to calculate the value of x for which f(x) = 0 zero for the general quadratic equation. Use the quadratic formula.

a.The program should have input boxes for a, b and c where a, b, and c are the coefficients of x2, x1 and x0

b.And out put the solutions for x.

c.if the solution contains the square root of a negative number then the program should print the message this equation has complex roots and out put the complex roots.

plz i'm really in need of help

a.The program should have input boxes for a, b and c where a, b, and c are the coefficients of x2, x1 and x0

b.And out put the solutions for x.

c.if the solution contains the square root of a negative number then the program should print the message this equation has complex roots and out put the complex roots.

plz i'm really in need of help

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## Comments

6,349Member:

: a.The program should have input boxes for a, b and c where a, b, and c are the coefficients of x2, x1 and x0

:

: b.And out put the solutions for x.

:

: c.if the solution contains the square root of a negative number then the program should print the message this equation has complex roots and out put the complex roots.

:

:

: plz i'm really in need of help

:

:

Place a couple of TLabels, TEdits and one TButton on the form. In the TButton.OnClick event code the following:

Use the StrToFloat() to convert the TEdit.Text property to doubles. This will give you the a, b, c coefficients as numbers, so you can calculate with them.

Then comes the maths part, just like you would do on paper. You might need an if-then-else-if-then-else statement to check the various answer possibilities:

[code]

if D < 0 then

begin

// Do something

end else if D = 0 then

begin

// Do something else

end else { no need for another if-then, because if the program gets

this far, D is not smaller or equal to 0, thus greater than 0 }

begin

// Third do something

end;

[/code]

Finally use FloatToStr() to convert the results back to strings to show them using another few TLabels.

Check out the help files for more info on these objects, functions.