Modify the following code to multiply the input code by 3 before outputting it.

Question

Modify the following code to multiply the input code by 3 before outputting it.

#include <hidef.h>      /* common defines and macros */

#include <mc9s12dg256.h>     /* derivative information */

#pragma LINK_INFO DERIVATIVE "mc9s12dg256b"

void main(void){

   char c;

   DDRB = 0xff; // Ports B = output

   DDRH = 0x00; // Ports H = input

   DDRJ = 2; // In order to use Wytec LEDs set PJ1 = output...

   PTJ = 0;      // ... and reset PJ1 to 0

   while(1){ // while(1) creates an endless program loop.

      c = PTH; // read DIP switches

      PORTB = c; // output to LEDs

   }

}

Explanation / Answer

void main(void){

   char c;

   DDRB = 0xff; // Ports B = output

   DDRH = 0x00; // Ports H = input

DDRB=DDRH*3;

   DDRJ = 2; // In order to use Wytec LEDs set PJ1 = output...

   PTJ = 0;      // ... and reset PJ1 to 0

   while(1){ // while(1) creates an endless program loop.

      c = PTH; // read DIP switches

      PORTB = c; // output to LEDs

   }

}

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