employee db in C

employee details:its stores the employee details in .dat file using file concepts
#include <stdio.h>

typedef struct Employee
{
    char fname[20];
    char lname[20];
    char sub_taken[20];
    char last_edu[20];
    char join_date[20];
    int id;
    int age;
    float bsal;
}Employee;

int main(void)
{

    int id;
    FILE *fp,*ft;
    char another,choice;
    Employee emp;
    char fname[20];
    char lname[20];
    long int recsize;

    fp=fopen("EMP.DAT","rb+");
    if(fp==NULL)
    {
        fp=fopen( "EMP.DAT","wb+");
        if(fp==NULL)
        {
            printf("Can't Open File");
            exit();
        }
    }
    recsize=sizeof(emp);
    while(1)
    {
        printf("1.Add Records2.Delete Records3.Modify Records4.ListRecords5.Exit");
        printf("Enter your choice");
        fflush(stdin);
        scanf("%c",&choice);
        switch(choice)
        {
            case'1':
                fseek(fp,0,SEEK_END);
                another='Y';
                while(another=='Y'|| another=='y')
                {
                    printf("Enter the first name,last name,age and basic salary : ");
                    scanf("%s %d %f",emp.fname,&emp.age,&emp.bsal);
                    printf("Enter joining date,id,last education,subject taken");
                    scanf("%s %d %s %s",emp.join_date,&emp.id,emp.last_edu,emp.sub_taken);
                    fwrite(&emp,recsize,1,fp);
                    printf("Add another Record (Y/N): ");
                    fflush(stdin);
                    another=getchar();
                }

                break;
            case '2':
                another='Y';
                while(another=='Y'|| another=='y')
                {
                    printf("Enter the id of the employee to be deleted : ");
                    scanf("%d",&id);
                    ft=fopen("TEMP.DAT","wb");
                    rewind(fp);
                    while(fread(&emp,recsize,1,fp)==1)
                    {
                        if(strcmp(emp.id,id)!=0)
                        fwrite(&emp,recsize,1,ft);
                    }
                    fclose(fp);
                    fclose(ft);
                    remove("EMP.DAT");
                    rename("TEMP.DAT","EMP.DAT");
                    fp=fopen("EMP.DAT","rb+");
                    printf("Delete another Record(Y/N): ");
                    fflush(stdin);
                    another=getchar();
                }

                break;
             case '3':
                another='Y';
                while(another=='Y'|| another=='y')
                {
                    printf("Enter name of employee to modify : ");
                    scanf("%s",emp.fname);
                    rewind(fp);
                    while(fread(&emp,recsize,1,fp)==1)
                    {
                        if(strcmp(emp.id,id)==0)
                        {
                            printf("Enter new fname,new lname,age,basicsalary,joining_date,subject taken and last education : ");

scanf("%s%s%d%f%s%s%s",emp.fname,emp.lname,&emp.age,&emp.bsal,emp.join_date,emp.sub_taken,emp.last_edu);
                            fseek(fp,-recsize,SEEK_CUR);
                            fwrite(&emp,recsize,1,fp);
                            break;
                         }
                     }
                     printf("Want to Modify another record(Y/N): ");
                     fflush(stdin);
                     another=getchar();
                 }

                 break;

              case '4':

                   rewind(fp);
                   while(fread(&emp,recsize,1,fp)==1)
                   printf("%s %s %d%g",emp.fname,emp.lname,emp.age,emp.bsal,emp.join_date,emp.last_edu,emp.sub_taken);
                   break;

             case '5':
                fclose(fp);
                exit();

        }
    }
 }