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Is this a bug or a feature of sprintf?

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kender

Joined: 09 Aug 2004
Posts: 768
Location: Silicon Valley

Is this a bug or a feature of sprintf?

Posted: Thu Feb 28, 2008 8:47 pm

Code:

int32 iADC; // 24-bit value from an external ADC AD7718, MSByte is always 0
// read the ADC
sprintf(strOut, "%6LX", iADC);

Expected: 6 hexadecimal characters
Actual: 8 hexadecimal characters

PCWH 3.240, PIC18LF4520
_________________
Read the label, before opening a can of worms.

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Thu Feb 28, 2008 9:57 pm

See the test program shown below:

vs. 3.240 displays this:

Quote:

00123456

vs. 3.249 displays this:

Quote:

00123456

vs. 4.068 displays this:

Quote:

123456

Code:

#include <18F452.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()
{
int32 iADC;
char strOut[20];

iADC = 0x00123456;

sprintf(strOut, "%6LX", iADC);

printf(strOut);

while(1);
}

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