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signed char and signed long

 
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aeroboy



Joined: 26 Apr 2009
Posts: 9

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signed char and signed long
PostPosted: Tue Apr 28, 2009 5:36 pm     Reply with quote
Hello,

Does the CCS compiler support a signed char subtraction from a signed long?

Code:

signed long x;
signed char y;
x=989;
y=-45;
x=x+y;
x=944


I do not have a way to verify this but I need it to know how to do the code.

Thanks.
--Luis
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Apr 28, 2009 5:49 pm     Reply with quote
Quote:
I do not have a way to verify this

Do you have the CCS compiler and MPLAB ? If so, you have the power
to make a test program and run it in the MPLAB simulator. Configure
the simulator to display printf() text in the Output Window.
Instructions on how to do this:
http://www.ccsinfo.com/forum/viewtopic.php?t=23408&start=1

Here's the output of the following program:
Quote:
944


Here is the test program:
Code:
#include <16F877.H>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

//======================================
void main()
{
signed long x;
signed char y;

x=989;
y=-45;
x=x+y;
printf("%ld", x);

while(1);
}
SherpaDoug



Joined: 07 Sep 2003
Posts: 1640
Location: Cape Cod Mass USA

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PostPosted: Tue Apr 28, 2009 5:51 pm     Reply with quote
Standard C rules say it should promote Y to a long and then do the math. I would be astonished if CCS could not handle this automatically.
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