dbedit calculation problem

zxchy135

Is the calculation of dbedit the same as edit?
dbedit3.Text: = floattostr (strtofloat (dbedit1.Text) * strtofloat (dbedit2.Text));
The error is `` 丨 is not a valid floating point value

沧浪123

empty? The landlord can first see if the text is not empty yet. . . showmessage (trim (dbedit.text))

lazying

Replace dbedit3 with edit

lazying

The first floor is right

zxchy135

Hmm is empty, how can I make him non-empty?

lazying

Add 0 in

zxchy135

No wow, I wrote it in the onchange event of edit2

chenruhai

If it is empty, just let it be 0.

stevevai

That's also simple. Before you execute this paragraph, you first judge whether 1 and 2 are null values. If there is one, the value of 3 is 0. If you don't, then it's calculated.

zxchy135

I have formcreat let edit1,2,3 be 0, and showmessage is still empty when I open the window.