Temperature monitoring system using lm35 in atmega32

#include<avr/io.h>
#include<util/delay.h>
#include<stdio.h>
void cmd()
{
 PORTB=0x04;
 _delay_ms(150);
 PORTB=0x00;
}
void display()
{
 PORTB=0x05;
 _delay_ms(150);
 PORTB=0x01;
}
void lcdstring(unsigned char *p)
{
 while(*p!='\0')
 {
  PORTC=*p;
  display();
  p++;

 }
}
unsigned char arr[]={0x38,0x0e,0x80,0x06};
 unsigned int a;
 unsigned char res[4];
 int i;
 void main()
 {
  DDRA=0x00;
  DDRB=0xff;
  DDRC=0xff;
  for(i=0;i<=3;i++)
  {
 
   PORTC=arr[i];
   cmd();
  }
  lcdstring("Temperature is");
  ADMUX=0xc0;
  ADCSRA=(1<<ADEN)|(1<<0);


  while(1)
  {
 
   ADCSRA|=(1<<ADSC);
   while(!(ADCSRA&(1<<ADIF)));
   a=(ADC)/4;
   sprintf(res,"%d",a);
   PORTC=0xc0;
   cmd();
   lcdstring(res);
   }
 
 
 }