I'm having trouble with IOSTREAM.
What is the problem ?
(I'm using DMC++ 8.20.)


----------------------------------
#include <stream.h>
void main()
{
	float a,b;
	a=1;
	b=0.05;
	cout << a << " - " << b << " = " <<  a-b << endl;
	b=0.005;
	cout << a << " - " << b << " = " <<  a-b << endl;
	b=0.0005;
	cout << a << " - " << b << " = " <<  a-b << endl;
}

-----------------------------------
C:\Temp>sc float.cpp
link float,,,user32+kernel32/noi;


C:\Temp>float
1 - 0.05 = 0.95
1 - 0.00499999 = 0.995
     ~~~~~~~
1 - 0.0005 = 0.9995

Try using 'double' instead of 'float'!
You are using a 4 byte floating point and expect great
precision!?

Jan



Isle Choi wrote:

> I'm having trouble with IOSTREAM.
> What is the problem ?
> (I'm using DMC++ 8.20.)
>
> ----------------------------------
> #include <stream.h>
> void main()
> {
>         float a,b;
>         a=1;
>         b=0.05;
>         cout << a << " - " << b << " = " <<  a-b << endl;
>         b=0.005;
>         cout << a << " - " << b << " = " <<  a-b << endl;
>         b=0.0005;
>         cout << a << " - " << b << " = " <<  a-b << endl;
> }
>
> -----------------------------------
> C:\Temp>sc float.cpp
> link float,,,user32+kernel32/noi;
>
> C:\Temp>float
> 1 - 0.05 = 0.95
> 1 - 0.00499999 = 0.995
>      ~~~~~~~
> 1 - 0.0005 = 0.9995