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# Help in delphi programming

Posts: 3Member
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

· ·

• Posts: 6,349Member
: 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
:
:
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.
· ·