Accept a character as input and check whether the character is a digit.( Check if it is in the range 0 to 9 both inclusive)

#include<stdio.h>

void main()
{
int i=0,flag=0,num;
printf("\nEnter the Number between(0 to 9) : ");
scanf("%d",&num);

if(num<=9)
{

 while(i<=9)
 {
  if(num==i)
  {
  flag=1;
  break;
  }
  else
  {
  i++;
  }
 }
  if(flag==1)
  {
  printf("\n It is Digit.");
  }
  else
  {
  printf("\n Not Digit.");
  }

}


 else
 {
 printf("\n Number not between 0 to 9");
 }


getch();

}