C PROGRAM TO DISPLAY PRIME NUMBERS BETWEEN TWO NUMBERS

#include<stdio.h>
void main()
{
  int a, b, i, j, flag;
  printf("Enter two numbers : ");
  scanf("%d %d", &a, &b);
  printf("Prime numbers between %d and %d are : ", a, b);
  for(i=a+1; i<b; ++i)
  {
      flag=0;
      for(j=2; j<=i/2; ++j)
      {
        if(i%j==0)
        {
          flag=1;
          break;
        }
      }
      if(flag==0)
        printf("%d ",i);
  }
  return 0;
}
OUTPUT
Enter two numbers :12
30
Prime numbers between 12 and 30 are : 13 17 19 23 29