Salary Management System In C

#include <stdio.h>

#include<string.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, check;

          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");

                            

                   }

          }

          recsize=sizeof(emp);

          while(1)

          {

printf("1.Add Records 2.Delete Records 3.Modify Records      4.ListRecords 5.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(emp.id!=id)

                             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(emp.id!=id)

                                                          {

                                                           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();//taking Input

                                       }

                                       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);//File is closed

                                      return 0;

                  

                   }

          }

 }