Determines whether the input is a floating point number.

Determines whether the input is a floating point number.
When editing a VC program, the number of Float entries is often controlled. If the input box is set to float, it can meet the requirements, but it may encounter some difficulties in real-time control, for example, the decimal point cannot be entered.
Therefore, it is more convenient to set it to the cstring type and write a function for control.
In this way, you can easily control the number of decimal places after which only a few decimal places can be entered.
Its function is
Bool cisfloatdlg: isfloat (cstring & STR, int ID)
{
Int dotflag = 0;
// Whether it is a floating point number
For (INT I = 0; I <Str. getlength (); I ++)
{
If (STR [I] = '.')
Dotflag ++;
If (dotflag> 1) // more than one decimal point
|
! (STR [I] = '. ') | (STR [I]> = '0' & STR [I] <= '9') // The number entered is not. 0-9
)
{
MessageBox ("not a number ");
(Cedit *) getdlgitem (ID)-> setsel (0,1000, true );
Return false;
}
}
// Only two decimal places can be entered
Int dotposition = Str. Find (".");
If (dotposition! =-1)
{
STR = Str. Left (dotposition + 3); // Delete the last position
Updatedata (false );
(Cedit *) getdlgitem (ID)-> setsel (, false); // The focus is at the end.
Return false;
}
Return true;
}
Original code download http://download1.csdn.net/down3/20070610/10104714439.rar