help for interfacing the lm35 with atmega8

#include <avr/io.h> 

int main (void) 
{ 
   DDRE |= (1 << 2); // Set LED1 as output 
   DDRG |= (1 << 0); // Set LED2 as output 

   ADCSRA |= (1 << ADPS2) | (1 << ADPS1) | (1 << ADPS0); // Set ADC prescalar to 128 - 125KHz sample rate @ 16MHz 

   ADMUX |= (1 << REFS0); // Set ADC reference to AVCC 
   ADMUX |= (1 << ADLAR); // Left adjust ADC result to allow easy 8 bit reading 

   // No MUX values needed to be changed to use ADC0 

   ADCSRA |= (1 << ADFR);  // Set ADC to Free-Running Mode 

   ADCSRA |= (1 << ADEN);  // Enable ADC 
   ADCSRA |= (1 << ADSC);  // Start A2D Conversions 

   for(;;)  // Loop Forever 
   { 
      // TODO: Test ADC Value and set LEDs 
   } 
}

#define ADSC 6
#define ADIF 4

void adc_init (void);
unsigned char adc_read (unsigned char ch_select);

void adc_init (void)
{
    ADCSRA = 0x83;
}

unsigned char adc_read (unsigned char ch_select)
{
    unsigned char data;
    ADMUX = ch_select;
    
    ADCSRA.ADSC = 1;
    while (ADCSRA.ADIF == 0);
    data = ADCH;
    ADCSRA.ADSC = 0;
    return data;
}

#include<stdio.h>
#include<string.h>

#include<avr/io.h>
#include<util/delay.h>

#include "uart.h"

void ADC_Init();
int read_adc();
unsigned int ADC_calculating();
unsigned int array[10];
unsigned int ADC_VALUE;
unsigned int value,temp; 

void main()
{
	
	_delay_ms(50);

	UART_Init(25);
    UART_TransmitString("Testing the room temperature:\r\n");

	DDRB = 0x01;
	PORTB= 0x01;
	
	DDRB = 0x00;
	PORTB= 0x00;

	ADC_Init();

	while(1)
	{
		if(bit_is_clear(PINB,0))
		{
			ADC_calculating();

			while(bit_is_clear(PINB,0));
		}
	}
}

void ADC_Init()
{
	ADCSRA = 0x00;

	ADMUX  = 0x40;
	ADCSRA = 0x86;
}

int read_adc()
{
    //select the ADC channel  
	ADMUX |= 0x01;
	
	//START THE ADC CONVERATION

	ADCSRA |= (1<<ADSC);

	//WAIT FOR CONVERATION TO COMPLETE

	while(!(ADCSRA) & (1<< ADIF));

	//CLEAR ADIF BY WRITING ONE TO IT

	ADCSRA |= 0x01;

	return(ADC);
}

unsigned int ADC_calculating()
{

	ADC_VALUE = read_adc();

	itoa(ADC_VALUE, array, 10);
	UART_TransmitString("ADC:");
	UART_TransmitString(array);
	UART_TransmitString("\r\n");

	value = ADC_VALUE * 4.8875;

	itoa(value, array, 10);
	UART_TransmitString("Ref:");
	UART_TransmitString(array);
	UART_TransmitString("\r\n");
	
	temp = value / 10;

	itoa(temp, array, 10);
	UART_TransmitString("temp:");
	UART_TransmitString(array);
	UART_TransmitString("\r\n");
	UART_TransmitString("\n");
}

Testing the room temperature:
ADC:0
Ref:0
temp:0

ADC:63
Ref:307
temp:30

ADC:62
Ref:303
temp:30

ADC:62
Ref:303
temp:30

ADC:62
Ref:303
temp:30

ADC:62
Ref:303
temp:30

ADC:62
Ref:303
temp:30

ADC:62
Ref:303
temp:30

ADC:63
Ref:307
temp:30

ADC:62
Ref:303
temp:30