Hi Vignesh

To Convert number to a string the following function seems to be better than your function(i.e tostr). This will also saves your memory and increases the processing speed.

char* Convert_to_Str(unsigned int num)
{
unsigned int base;
unsigned char rem,x;
char buff[6];
char *ptr=buff;
if(num == 0)
{
*ptr = num + 0x30;
ptr++;
}
else
{
while(num)
{
rem = num/10;
num = num%10;
base =(base * 10) + rem + 0x30 ;
*ptr = base;
ptr++;
}
}
*ptr = '';

return buff;
}