[51] problem in Generating random nmber using rand() function in embedded c

#include <stdlib.h>
#include <stdio.h> /* for printf */

void tst_rand (void) {
  int i;
  int r;

  for (i = 0; i < 10; i++) {
    printf ("I = %d, RAND = %d\n", i, rand ());
  }
}

 #include<reg51.h>
 #include <stdlib.h>
 sfr lcd_data_pin=0xA0;//p2 port
sbit rs=P1^0;
sbit rw=P1^1;
sbit e=P1^2;
void delay(unsigned int count)    //Function to provide delay
{
    int i,j;
    for(i=0;i<count;i++)
    for(j=0;j<1275;j++);
}
void lcd_cmd(unsigned char value)
{
	lcd_data_pin = value;
	rs=0;
	rw=0;
	e=1;
	delay(1);
	e=0;
	delay(1);
}
void lcd_data(unsigned char value)
{
	lcd_data_pin =value;
	rs=1;
	rw=0;
	e=1;
	delay(1);
	e=0;
	delay(1);
}
void lcd_init()
{	
         lcd_cmd(0x38);
	lcd_cmd(0x0e);
	lcd_cmd(0x01);	
	lcd_cmd(0x80);
}
void lcd_string(unsigned char *disp)	 //LCD string function 
{
	char x;
	for(x=0;disp[x]!=0;x++)
	{
		lcd_data(disp[x]);
	}

}

  void lcd_data_int(int time_val)		//  to send three digit number
{
	int int_amt;
    int_amt = time_val/1000;
	lcd_data(int_amt+48);
	time_val = time_val%1000;
	int_amt = time_val/100;
	lcd_data(int_amt+48);
	time_val = time_val%100;
	int_amt = time_val/10;
	lcd_data(int_amt+48);
	int_amt = time_val%10;	
	lcd_data(int_amt+48);
}

void tst_rand (void) {
  unsigned int i;	  

  i= rand();
 lcd_cmd(0x80);
lcd_string("number: ");
delay(250);

lcd_cmd(0xc0);
 lcd_data_int(i);
 
 
}
void main()
{
lcd_init();
  while(1)
   {
   	  tst_rand ();
   }   

}

#include <stdlib.h>     /* srand, rand */