displaying decimal point on LCD using 18f5420

hey there

i really need help with this.
im programming pic 18f4520 as volt ampmeter. as of now, i could display the voltage up to 12v without decimal point on the LCD. e.g 8.45v is = to 845v on the LCD screen.

i really need to put the decimal point so that the reading would be more accurate.
here' my code.
im using mplab v7.6 c18

#include <p18f4520.h>
#include <delays.h>
#include <stdlib.h>
float result;
void Init_LCD(void);

void W_ctr_4bit(char);
void W_data_4bit(char);

#define LCD_DATA PORTD
#define LCD_RW PORTAbits.RA2
#define LCD_RS PORTAbits.RA3
#define LCD_E PORTAbits.RA1

unsigned char LCD_TEMP, i;
char MESS[16]= "VOLTAGE display";
char MESS2[12]= " . v 0.6A";
char MESS3[2]= ".";



unsigned char Buf[6];

void InterruptHandlerLow(void);
unsigned int a;
float temp,result;
#pragma code InterruptVectorLow= 0x018
void InterruptVectorLow(void) {
_asm
goto InterruptHandlerLow

_endasm
}
#pragma code
#pragma interruptlow InterruptHandlerLow
void InterruptHandlerLow()
{
if(PIR1bits.TMR1IF){
Delay10TCYx(1);
ADCON0bits.GO=1;
while(ADCON0bits.DONE);
temp = (ADRESH * 256.0) + ADRESL; //Make as 16-bit WORD
result = 500.0 * temp / 1024.0; // or result = 0.48828125 * temp;
a = (unsigned int)(result + 0.5);

//result>>=4;

W_ctr_4bit(0xc0);
for(i=0; i<11; i++)
{W_data_4bit(MESS2);
}
W_ctr_4bit(0x42);
for(i=0; i<1; i++)
{W_data_4bit(MESS3);
}


W_ctr_4bit(0xc0);
itoa(result,MESS);
i=0;
while(MESS)
{
W_data_4bit(MESS);
i++;}
TMR1H=0x0b;
TMR1L=0xdc;
PIR1bits.TMR1IF=0;
}

}
void main()
{
TRISD=0;
TRISA=0b11110001;
TRISB=0b11110000;
ADCON0=0b00000001;
ADCON1=0b00001110;
ADCON2=0b10000100;

INTCONbits.GIE=0;
Init_LCD();
for(i=0;i<15;i++)
{
W_data_4bit(MESS);
}
PORTB=0b00000110;
RCONbits.IPEN=1;
IPR1bits.TMR1IP=0;
TMR1H=0x0b;
TMR1L=0xdc;
T1CON=0b11110001;
PIR1bits.TMR1IF=0;
PIE1bits.TMR1IE=1;
INTCONbits.GIEL=1;
INTCONbits.GIE=1;
while(1);
}
void Init_LCD()
{
Delay1KTCYx(15);
W_ctr_4bit(0x03);
Delay1KTCYx(5);
W_ctr_4bit(0x02);
W_ctr_4bit(0b00101000);
W_ctr_4bit(0b00001100);
W_ctr_4bit(0b00000110);
W_ctr_4bit(0b00000001);
}
void W_ctr_4bit(char x)
{
LCD_RW=0;
LCD_RS=0;
LCD_TEMP=x;
LCD_TEMP>>=4;
LCD_E=1;
LCD_DATA=LCD_TEMP;
Delay1KTCYx(1);
LCD_E=0;
Delay1KTCYx(1);
LCD_TEMP=x;
LCD_TEMP &=0x0f;
LCD_E=1;
LCD_DATA=LCD_TEMP;
Delay1KTCYx(1);
LCD_E=0;
Delay1KTCYx(1);
}


void W_data_4bit(char x)
{
LCD_RW=0;
LCD_RS=1;
LCD_TEMP=x;
LCD_TEMP>>=4;
LCD_E=1;
LCD_DATA=LCD_TEMP;
Delay1KTCYx(1);
LCD_E=0;
Delay1KTCYx(1);
LCD_TEMP=x;
LCD_TEMP &=0x0f;
LCD_E=1;
LCD_DATA=LCD_TEMP;
Delay1KTCYx(1);
LCD_E=0;
Delay1KTCYx(1);
}

any help would be appreciated

can't you just

W_data_4bit('.');

or

W_data_4bit(46);
?