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how to printf the remainder ?

 
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johnpoo



Joined: 23 Mar 2010
Posts: 9

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how to printf the remainder ?
PostPosted: Thu Apr 15, 2010 9:31 pm     Reply with quote
How can I printf the result of the modulus operator?
Code:

#include <16F877.h>
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
#fuses HS,NOWDT,NOPROTECT,NOBROWNOUT,PUT

int decimal;
int b;

void main()
{
  decimal = 30;
  b = ((decimal % 2)==0);
 
  printf( "b = %u\n\r", b );
}

Thanks.
johnpoo



Joined: 23 Mar 2010
Posts: 9

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PostPosted: Thu Apr 15, 2010 9:50 pm     Reply with quote
Actually I want to do a decimal to binary program.

Thanks
Ttelmah



Joined: 11 Mar 2010
Posts: 19515

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PostPosted: Fri Apr 16, 2010 2:14 am     Reply with quote
b, in your example, is a number just like any other.
However, use the bit tests, a mask, or shift instructions. A lot less work...
For example:
Code:

int8 number;
int8 ctr;
int8 mask;

    mask=128;
    number=100;
    for (ctr=0;ctr<8;ctr++) {
       if (mask&number) putc('1');
       else putc('0');
       mask>>=1;
    }
   

This would output 01100100 (binary representation of 100, output MSb first).

Or:
Code:

int8 number;
int8 ctr;
int8 bit;

    number=100;
    for (ctr=0;ctr<8;ctr++) {
       bit=shift_left(&number,1,0);
       putc(bit+'0');
    }


Downside of this, is that it destroys 'number' .

Best Wishes
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