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regarding Float calculations in Keil C

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yviswanathbe

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Hi Friends,

I am facing problem with Float variable in my program.

Code: 
void DAC_SET(void)	 
{
    float crange, scale;
    crange=(65535/40); //the result should be 1638.375 but i am getting 1638 integer part only.
    scale=temprecord.current; //user desired value stored in a structure
    DAC_Count=crange*scale;
}

I am using keil microvision 3. I have included MATH.H
C51FPS.LIB is exists in the LIB folder.
Whats wrong i am doing here.

somebody please help me?

Thanks and Regards,
Viswanath.
 

Hi Friend

yviswanathbe said:
Code: 
void DAC_SET(void)	 
{
    float crange, scale;
    crange=(65535/40); //the result should be 1638.375 but i am getting 1638 integer part only.
    scale=temprecord.current; //user desired value stored in a structure
    DAC_Count=crange*scale;
}
Click to expand...


In your Code , Both value 65535 and 40 are Integer.
For this reason it create integer result

Try this line

crange=(65535/40.0);
or
crange=(65535.0/40);
or
crange=(float)(65535/40);

it is casting problem.

Shyam
INDIA
 
Any change in settings of the compiler?

---------- Post added at 09:25 ---------- Previous post was at 09:24 ----------
crange=(float)(65535/40);
Click to expand...
is desirable.
Regards,
Jerin.
 
Hi Shyam and Jerin,

Its working now.

Thanks for your help.

Regards,
Viswanath
 

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