PIC PORTA digital input HOW

 //#include <p18f4450.h>
#include <p18cxxx.h>
//#pragma config WDT = OFF, LVP = OFF, FOSC = INTOSC_HS  //internal oscillator

#pragma config WDT=OFF,LVP=OFF,FOSC=HSPLL_HS,PLLDIV=5,CPUDIV=OSC2_PLL3 //run with external oscillator

void main (void);
void InterruptHandlerLow (void);

#define LCD_DATA   PORTD
#define LCD_EN    PORTCbits.RC2
#define LCD_RW    PORTCbits.RC1
#define LCD_RS     PORTCbits.RC0

#define A PORTAbits.RA0
#define B PORTAbits.RA1
#define C PORTAbits.RA2
#define D PORTAbits.RA3


unsigned char data[]="123456789     90";

unsigned char dd[]="DDDDDDDDDDDDD123";
unsigned char aa[]="AAAAAAAAAAAAA123";
unsigned char bb[]="BBBBBBBBBBBBB123";
unsigned char cc[]="CCCCCCCCCCCCC123";
unsigned char xx[]="xxxxxxxxxxxxxxxx";



void delay(int);
void WRT_COMM(void);
void WRT_DATA(void);
unsigned char *varr , var;

void LCD_sendstring(unsigned char *varr);

void LCD_dt();
void LCD_senddata(unsigned char var );

void initilizeLCD(void);
void lcd_clear(void);

void main ()
{
char DATA;


varr=&data[0];
ADCON1 = 0xFF; // turn all of port a to digital I/O
 

TRISCbits.TRISC6=1;
TRISAbits.TRISA3=1;
TRISAbits.TRISA2=1;
TRISAbits.TRISA1=1;
TRISAbits.TRISA0=1;
 

TRISAbits.TRISA0=1;
TRISAbits.TRISA1=1;
TRISAbits.TRISA2=1;
TRISAbits.TRISA3=1;
 

CMCON  = 0x07;  // CM0, CM1 and CM2 set to 1
 
initilizeLCD();
lcd_clear();
LCD_dt(); 



while(1)
{
	if(A==1 && B==0 && C==0 && D==0)
		{
	varr=&aa[0];
	LCD_dt();
		}
	else if(A==1 && B==1 && C==0 && D==0)
		{
	varr=&bb[0];
	LCD_dt();
		}
	else 
	if(A==1 && B==0 && C==1 && D==0)
		{
	varr=&cc[0];
	LCD_dt();
		}
	else if(A==1 && B==0 && C==0 && D==1)
		{
	varr=&dd[0];
	LCD_dt();
		}
	else
	varr=&xx[0];
	LCD_dt();

 }

}

TRISAbits.TRISA3=1;
TRISAbits.TRISA2=1;
TRISAbits.TRISA1=1;
TRISAbits.TRISA0=1;
 
 
TRISAbits.TRISA0=1;
TRISAbits.TRISA1=1;
TRISAbits.TRISA2=1;
TRISAbits.TRISA3=1;

ADCON1 = 0xFF; // turn all of port a to digital I/

//#include <p18f4450.h>  // not sure why this include does not work
#include <p18cxxx.h>


void main ()
{
  unsigned char DATA;
  
  ADCON1 = 0x0F; // *** turn all of port a to digital I/O
  CMCON  = 0x07;  // CM0, CM1 and CM2 set to 1 
  
  TRISA=0xFF;
  
  
  DATA = PORTA;  //  Works
  Nop();
  Nop();
  while(1);
}

ANSEL = 0x00;
ANSELH = 0x00;