Student record program

Hello guys, i posted this already yesterday, and i kinda worked it out already..however..

Code:

void add_record(record x, FILE *fp)
{
    char ans;
    int tempid, count;
    do
    {
        system("cls");
INPUT:
        printf("Student ID: "); scanf("%d", &tempid);
		count=id_check(tempid,x);
		if(count==1)
		{
			printf("\nStudent number already exists. Try again\n");
			getch();
			system("cls");
			goto INPUT;
		}
		else
			x.idno=tempid;
        fflush(stdin);
        printf("First Name: "); gets(x.Fname);
        printf("Last Name; "); gets(x.Lname);
        strupr(x.Lname);
        printf("Course: "); gets(x.course);
        printf("Age: "); scanf("%d", &x.age);
        fflush(stdin);
        printf("Tuition: "); scanf("%f", &x.tuition);
        system("cls");
        printf("Enter another record? Y/N");
        ans=toupper(getch());
        system("cls");
        fwrite(&x,sizeof(x),1,fp);
    }while(ans=='Y');
    fclose(fp);
}

int id_check(int tempid, record x)
{	
	int count=0,a=0;
	FILE *fp;

	record temp[100];

	fp=fopen("students_record.txt","r");

	while(!feof(fp))
    {
        fread(&temp[a],sizeof(record),1,fp);
        a++;
    }

	a-=1;

	for(int i=0;i<a;i++)
	{
		if(tempid==temp[i].idno)
			count++;
	}

	if(count>0)
		return 1;
	else
		return 0;
}

If i input a number that already exists, i got it to work already that it asks for another number, however though, if i input a new number, then after inputting all the info, i input another record using the same number, it doesn't display anymore that the number already exists.

example:

Enter number: 1
First Name:
.
.
.
.

Input another record? Y/N
Y

Enter number: 1 <----i used the same number but the program continues
First Name:

You can't open the file in id_check if you already have it open in add_record.


Quzah.