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strcmp problem

 
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kmp84



Joined: 02 Feb 2010
Posts: 354

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strcmp problem
PostPosted: Mon Jun 08, 2015 3:05 am     Reply with quote
Hi,
Any idea why "strcmp()" in this example return "0 (False)"?
CCS C ver.4.140
Code:

#include <18F46K22.h>
#fuses HSM,PLLEN,NOWDT,NOBROWNOUT,PUT,NOPROTECT,NOCPD,NOFCMEN,MCLR
#use delay(crystal=8MHz, clock=32MHz) // HS Mode with PLLx4 (4*8MHz=32MHz)

#use RS232(DEBUGGER,rcv=PIN_C0,xmit=PIN_C0,STREAM=STREAM_MONITOR)//Debug Monitor at 2400 Default speed

#include <string.h>

void main() {

   int8 s1[]={"1234567890"};
   int8 s2[]={"1234567890"};
   
   fprintf(STREAM_MONITOR,"\n\r S1: %s",s1);
   fprintf(STREAM_MONITOR,"\n\r S2: %s",s2);
   int8 res=0;
   res=strcmp(s1, s2);
   
   if(res) fprintf(STREAM_MONITOR,"\n\r s1 = s2");
   else fprintf(STREAM_MONITOR,"\n\r s1 # s2");
   
   while( 1 ) {

   }   
}

Thanks for attention!
Ttelmah



Joined: 11 Mar 2010
Posts: 19545

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PostPosted: Mon Jun 08, 2015 3:47 am     Reply with quote
Because it is not returning FALSE......

Read what strcmp returns. It is not 'TRUE/FALSE'.

Quote from manual:

"result is -1 (less than), 0 (equal) or 1 (greater than)".....
kmp84



Joined: 02 Feb 2010
Posts: 354

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PostPosted: Mon Jun 08, 2015 4:57 am     Reply with quote
Ttelmah wrote:
Because it is not returning FALSE......

Read what strcmp returns. It is not 'TRUE/FALSE'.

Quote from manual:

"result is -1 (less than), 0 (equal) or 1 (greater than)".....


Thanks Mr."Ttelmah" !
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