problem assignment DSP

Code C - [expand]
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//AM.c
 
#include "DSK6713_AIC23.h"          //codec-dsk support file
Uint32 fs=DSK6713_AIC23_FREQ_8KHZ;  //set sampling rate
short amp = 1;                      //index for modulation
 
void main()
{
 short baseband[20]={1000,951,809,587,309,0,-309,-587,-809,-951,-1000,-951,-809,-587,-309,0,309,587,809,951}; //400-Hz baseband
 short carrier[20] ={1000,0,-1000,0,1000,0,-1000,0,1000,0,-1000,0,1000,0,-1000,0,1000,0,-1000,0}; //2-kHz carrier 
 short output[20];
 short k;
 
 comm_poll();                            //init DSK, codec, McBSP
 while(1)                                //infinite loop
  {
   for (k=0; k<20; k++)
    {
     output[k]= carrier[k] + ((amp*baseband[k]*carrier[k]/10)>>12);
     output_sample(20*output[k]);        //scale output
    }
  }
}