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cerr



Joined: 10 Feb 2011
Posts: 241
Location: Vancouver, BC

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floating point
PostPosted: Tue Mar 08, 2011 1:53 pm     Reply with quote
Hi There,

Why would this:
Code:

fprintf(DEBUG,"%f * %f = %f\r\n",(float)scldpotval1,(float)scaler,(float)scldpotval1*(float)scaler);

Give me something like
33776.00 * 1.48 = 50000.00
scldpotval1 and scaler, both are of type float
I don't understand

compiler 4.119, 18f87k22
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Mar 08, 2011 2:14 pm     Reply with quote
With no test program, it's tough to know exactly what you're doing.
But if I compile the following program with vs. 4.119 and run it in
MPLAB simulator, I get this:
Quote:
33776.00 * 1.48 = 49988.48

Code:

#include <18F87K22.h>
#fuses XT, NOWDT, PUT, BROWNOUT
#use delay(clock=4000000)   
#use rs232(baud=9600, UART1, errors, stream=DEBUG)

//========================================
void main()
{
float scldpotval1 = 33776.00;
float scaler = 1.48;

fprintf(DEBUG,"%f * %f = %f\r\n",(float)scldpotval1,(float)scaler,(float)scldpotval1*(float)scaler);
 
while(1);
}

Always post a test program so we can duplicate your test environment.
Otherwise we're just guessing, and it may be a waste of time.
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