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 ();
   }

}