I have a problem my code to adc value in lcd using pic 16f877a

#include<pic.h>
#include<string.h>
__CONFIG(0x3f72);
#ifndef _XTAL_FREQ
#define _XTAL_FREQ 20000000
#endif
#define DATA PORTD
#define RS RE1
#define EN RE2
#define lcd_strobe(){EN=1;__delay_us(160);EN=0;}
void lcd_cmd(unsigned char);//LCD display function
void lcd_dat(unsigned char);
void lcd_disp(const char *);
void lcd_num(unsigned char);
void main()
{
TRISA=0x01;
PORTA=0x01;
ADCON0=0x80;//choose fosc/32//choose ch1()//Taq>1.6us
ADCON1=0x8e;//AN0 only has analog pin
TRISD=0x00;
PORTD=0x00;
TRISE=0x00;
PORTE=0x00;
lcd_cmd(0x38);
lcd_cmd(0x38);
lcd_cmd(0x38);
lcd_cmd(0x38);
lcd_cmd(0x0E);
lcd_cmd(0x01);
lcd_cmd(0x0c);
lcd_cmd(0x80);
while(1)
{
//unsigned char val[20]="ADC VALUE:";
unsigned int adc, adc_value_h,adc_value_l,adc_value;
lcd_disp("ADC VALUE:");//Passing String
lcd_cmd(0x80);
__delay_ms(1000);
ADON=1;
//GO_DONE=1;
// __delay_us(20);
while(GO_DONE)//checking adc conversion
__delay_us(20);// ADIF=0;
adc_value_h=ADRESH;// adc_value_h=adc_value_h<<8;
adc_value_l=ADRESL;
adc=adc_value_h<<8;
adc_value=(adc)|adc_value_l;
adc_value=(unsigned char)(adc_value*204.8);//adc conversion
lcd_num(adc_value);
}
}
void lcd_cmd(unsigned char cmd)
{
DATA=cmd;
RS=0;
lcd_strobe();
}
void lcd_dat(unsigned char dat)
{
DATA=dat;
RS=1;
lcd_strobe();
}
void lcd_disp(const char *val)
{
while(*val!='\0')
{
lcd_dat(*val++);
//val++;
}
}
void lcd_num(unsigned char adc_val)
{
unsigned char a,b,c,d;
a=((adc_val/100)+0x30);
lcd_dat(a);
lcd_cmd(0xC0);
b=(((adc_val/10)%10)+0x30);
lcd_dat(b);
lcd_cmd(0xC2);
c=(((adc_val%10)%10)+0x30);
lcd_dat(c);
lcd_cmd(0xC3);

}
in this code no..error..but it cant show in lcd,proteus..any one help me whats the solution for this..thank in advance

Here adc_value=(unsigned char)(adc_value*204.8);//adc conversion you are converting int to char type and you will lose the higher byte of data.