printf question

[Sherpa Doug]

What is the difference between:

fprintf(fish,"$04lu\n\r",Temp);
and
fprintf(fish,"$4lu\n\r",Temp);

The manual says the 4 specifies how many characters are to be outputted, or 04 to indicate leading zeros.... So if I use just 4 do I get leading spaces? how does it generate 4 characters?

___________________________
This message was ported from CCS's old forum
Original Post ID: 9527

[PCM programmer]

:=What is the difference between:
:=
:=fprintf(fish,"$04lu\n\r",Temp);
:=and
:=fprintf(fish,"$4lu\n\r",Temp);
:=
:=The manual says the 4 specifies how many characters are to be outputted, or 04 to indicate leading zeros.... So if I use just 4 do I get leading spaces? how does it generate 4 characters?
----------------------------------------------

The program given below, generated this output:

<PRE>
0123
123
</PRE>

The first line has a leading 0, and the 2nd line has a leading
space.


#include "c:\program files\picc\devices\16F877.h"
#fuses HS,NOWDT,NOPROTECT,PUT,BROWNOUT, NOLVP
#use Delay(clock=8000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, STREAM=Fish)
//======================================
main()
{
long Temp;
Temp = 123;

fprintf(fish,"\%04lu\n\r",Temp);
fprintf(fish,"\%4lu\n\r",Temp);

while(1);
}
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This message was ported from CCS's old forum
Original Post ID: 9529

[Ed Arnold]

:=What is the difference between:
:=
:=fprintf(fish,"$04lu\n\r",Temp);
:=and
:=fprintf(fish,"$4lu\n\r",Temp);
:=
:=The manual says the 4 specifies how many characters are to be outputted, or 04 to indicate leading zeros.... So if I use just 4 do I get leading spaces? how does it generate 4 characters?
:=
I have used this on many projects and you are correct "\%04lu" will give you leading zeros and "\%4lu" will in fact give leading spaces, at least on an LCD screen. Sort of like right justifying the output. I have not tried this for outputting on a serial stream. By the way, I think you meant to use '\%' signs in your code instead of '$'. Hope this helps.

Ed Arnold
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This message was ported from CCS's old forum
Original Post ID: 9530

[david smith]

:=What is the difference between:
Note also, at least with this compiler,
\%04Lu is interpreted the same, and the L is not misread as 1.
Also, before you try, the leading zero doesn't work for floats.
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This message was ported from CCS's old forum
Original Post ID: 9538

[Phil G]

:=:=What is the difference between:
:=:=
:=:=fprintf(fish,"$04lu\n\r",Temp);
:=:=and
:=:=fprintf(fish,"$4lu\n\r",Temp);
:=:=
:=:=The manual says the 4 specifies how many characters are to be outputted, or 04 to indicate leading zeros.... So if I use just 4 do I get leading spaces? how does it generate 4 characters?
:=----------------------------------------------
:=
:=The program given below, generated this output:
:=
:=<PRE>
:=0123
:= 123
:=</PRE>
:=
:=The first line has a leading 0, and the 2nd line has a leading
:=space.
:=
:=
:=#include "c:\program files\picc\devices\16F877.h"
:=#fuses HS,NOWDT,NOPROTECT,PUT,BROWNOUT, NOLVP
:=#use Delay(clock=8000000)
:=#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, STREAM=Fish)
:=//======================================
:=main()
:={
:=long Temp;
:=Temp = 123;
:=
:=fprintf(fish,"\%04lu\n\r",Temp);
:=fprintf(fish,"\%4lu\n\r",Temp);
:=
:=while(1);
:=}

What is the output if Temp = 12345 ?
___________________________
This message was ported from CCS's old forum
Original Post ID: 9545

[Tomi]

Not sure about CCS C but the original C printf definition says that your format expresssion must long enough to fit the number. So in a legal C the output for 12345 is "12345" regardless of the "\%04lu" format (the printf could not truncate the number). And maybe this is the reason why we have problems with printing floats.


:=:=:=What is the difference between:
:=:=:=
:=:=:=fprintf(fish,"$04lu\n\r",Temp);
:=:=:=and
:=:=:=fprintf(fish,"$4lu\n\r",Temp);
:=:=:=
:=:=:=The manual says the 4 specifies how many characters are to be outputted, or 04 to indicate leading zeros.... So if I use just 4 do I get leading spaces? how does it generate 4 characters?
:=:=----------------------------------------------
:=:=
:=:=The program given below, generated this output:
:=:=
:=:=<PRE>
:=:=0123
:=:= 123
:=:=</PRE>
:=:=
:=:=The first line has a leading 0, and the 2nd line has a leading
:=:=space.
:=:=
:=:=
:=:=#include "c:\program files\picc\devices\16F877.h"
:=:=#fuses HS,NOWDT,NOPROTECT,PUT,BROWNOUT, NOLVP
:=:=#use Delay(clock=8000000)
:=:=#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, STREAM=Fish)
:=:=//======================================
:=:=main()
:=:={
:=:=long Temp;
:=:=Temp = 123;
:=:=
:=:=fprintf(fish,"\%04lu\n\r",Temp);
:=:=fprintf(fish,"\%4lu\n\r",Temp);
:=:=
:=:=while(1);
:=:=}
:=
:=What is the output if Temp = 12345 ?
___________________________
This message was ported from CCS's old forum
Original Post ID: 9557