上一项后面的逗号应该怎么去掉?

#include <stdio.h>

int main()
{
  int n1, n2, temp, n, d, p;
  printf("Enter two numbers(The limits of your prime numbers): ");
  scanf("%d %d", &n1, &n2);
  if (n1>n2)
  {
      temp=n1;
      n1=n2;
      n2=temp;
  }
  printf("The prime numbers between %d and %d are: ", n1, n2);
  for(n=n1;(n<=n2)||(n<2000);++n)
  {
      p=1;
      for(d=2; d<=n/2; ++d)
      {
        if(n%d==0)
        {
          p=0;
          break;
        }
      }
      if(p==1)
      {
        if (n==1)
        {continue;}
        printf("%d",n);
        //I don't know what to put here so that the last term won't have a comma
        printf(", ");

      }
  }
  return 0;
}
#include <stdio.h>

int main()
{
  int n1, n2,