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printf float doesn't work

 
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kalman



Joined: 19 Jan 2010
Posts: 4

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printf float doesn't work
PostPosted: Mon Mar 08, 2010 9:13 pm     Reply with quote
Good day, I have got this printf problem when I try simulating with Proteus.
Using pcwhd 4.084
Code:

#include <16f877a.H>
#fuses HS, NOWDT, NOPROTECT, BROWNOUT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)

#define INTS_PER_SECOND 60     

long count;     

#int_rtcc                         
void clock_isr() {               
      ++count;
}

void main() {

   long start,diff;
   float dt;

   set_timer0(0);
   setup_counters( RTCC_INTERNAL, RTCC_DIV_256 | RTCC_8_BIT);
   enable_interrupts(INT_RTCC);
   enable_interrupts(GLOBAL);

   do {

      start=count;
      getc();
      diff=count-start;
      dt=(diff)/60;
      printf("%Ld %Ld %6.4f seconds.\n\r",count,start,dt);

   } while (TRUE);

}

For example, start=0, count=133;
the value dt should be 2.2166, but it only shows 2.
Did I miss something there?
Jerson



Joined: 31 Jul 2009
Posts: 125
Location: Bombay, India

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PostPosted: Tue Mar 09, 2010 7:23 am     Reply with quote
change this
Code:
      dt=(diff)/60;

to this
Code:

      dt=(float)diff/60;

and you'll get the result you want
kalman



Joined: 19 Jan 2010
Posts: 4

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PostPosted: Tue Mar 09, 2010 8:25 am     Reply with quote
wow, thanks
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