Help appriciated for this code......Thanks

#include <16F676.h>   
#device adc=10    
#fuses INTRC_IO,NOWDT,PUT,NOPROTECT,BROWNOUT,NOMCLR   
#use delay (clock=4000000) // 4MHz clock   
   
#rom  0x3ff={0x3444}   
   
#byte PORTA = 0x05   
#byte PORTC = 0x07   
#byte TRISA = 0x85   
#byte TRISC = 0x87   
   
#define SPORTA PORTA   
#define SPORTC PORTC   
   
#define  TICKS_BETWEEN_INTERRUPTS      5000 //5000   
#define  INTERRUPT_OVERHEAD            35   
#define  TMR1RESET (0xFFFF-(TICKS_BETWEEN_INTERRUPTS-INTERRUPT_OVERHEAD))   
   
const char SegCode[11] = {0x40,0x57,0x22,0x06,0x15,0x0C,0x08,0x56,0x00,0x04,0xFF};   
    //                       0    1    2    3    4    5    6    7    8    9   
const char Column[3]   = {0x02,0x01,0x04};   
static char Segment[3] = {0x7f,0x7f,0x7f};     
static unsigned char ColCount=0x00;   
   
void CPU_SETUP(void);   
void Display(void);   
void HTO7S(unsigned int32 Num);   
   
byte i;   
unsigned int32 result;   
   
#INT_TIMER1   
void Timer1(void)   
{      
    set_timer1(TMR1RESET);   
    Display();     
}      
   
void main()   
{          
    unsigned char i;   
       
    CPU_SETUP();   
       
    while(true)   
    {              
        result=0;   
        for (i=0;i<20;i++)   
        {   
            set_adc_channel(3);    
            delay_ms(1);    
            result=result+read_adc();   
        }   
            //result = 0x3fe;                                      
        HTO7S(result/20);      
        delay_ms(200);             
    }   
       
}   
   
void CPU_SETUP()   
{   
       
   setup_comparator(NC_NC_NC_NC);   // not use comparator module   
   setup_adc_ports( sAN3 | VSS_VDD);    
   setup_adc(ADC_CLOCK_DIV_64);   
   TRISA=0b00011000;   
   PORTA=0x27;   
   TRISC=0b00000000;   
   PORTC=0x37;   
      
      
   setup_timer_1(T1_INTERNAL|T1_DIV_BY_1);   
   set_timer1(TMR1RESET);   
   enable_interrupts(GLOBAL);   
   enable_interrupts(INT_TIMER1);      
}   
   
//-------------------------------------   
// Display routine   
//-------------------------------------   
void Display()   
{   
    PORTA = 0b00100111;   // off all digits column and Segment G   
    PORTC = 0b00111111;   // off segment a-f       
    delay_cycles(2);   
       
   
    if (ColCount>=3)    
    ColCount=0;   
           
    SPORTC = Segment[ColCount];   
    SPORTA = ((Segment[ColCount] & 0b01000000)>>1) | (Column[ColCount]^0x07);   
    ColCount++;                
}      
   
//--------------------------------------   
// Convet HEX 2 byte to 7-Segment code   
//--------------------------------------   
void HTO7S(unsigned int32 Num)   
{   
   
    unsigned int32 res;   
   
       
    Segment[0]=SegCode[30*Num/10230];   
    if (Segment[0]==0x40)    
    Segment[0]=0xFF;   
       
    res = 30*Num%10230;   
    Segment[1]=SegCode[10*res/10230];   
    res=10*res%10230;   
    Segment[2]=SegCode[10*res/10230];   
}