I’ve written this code till now. it is working for some intervals but not for all.

#include<stdio.h>
int main()
{
  int a,b,count=1; 
  printf("Enter lower bound of the interval: ");
  scanf("%d", &a); 
  printf("Enter upper bound of the interval: ");
  scanf("%d", &b); 
  printf("Prime numbers between %d and %d are: ",a, b);
 
  for (int i=a; i<=b; i++)
 {
  for (int j=2;j<i;j++)
  {
    if(i%j==0)
    { 
      count=0;
      break;
    }
    }
   if(count==1)
   {
    printf("%d ",i);
   }
 }
 return 0;
} 

Please help me identify the error.