to write data to a binary file error occurred in c

Question

hi friend,

    when I input the employee post memory error occurred.

Please help me, thanks.

Code is as follows:

#include<stdio.h>

#include<stdlib.h>

#define EMP_NUM_MAX 100

struct EmployeeInfo  // employee information structure

{

  char name[15];

  int  empID;

  float salary;

  char post[15];

}emp[EMP_NUM_MAX];

// function prototype declaration

void MainMenu(),void WriteData();

// main function

void main(void)

{

   int choice;

   MainMenu();

   printf("\t\tPlease enter your choice:");

   scanf("%d",&choice);

   switch (choice)

   {

       case 1:

    WriteData();

        break;

   }

}

void MainMenu()  // operator menu

{

system("cls"); // clear the screen

printf("\n\t\t **********************************************\n");

printf("\t\t * Employee Salary Management System For V1.0 *\n");

printf("\t\t **********************************************\n\n");

printf("\t\t 1.Add Employee Information\n");

printf("\t\t 2.Display All Employee Information\n");

printf("\t\t 3.Delete Employee Information\n");

printf("\t\t 4.Find Employee Records\n\n");

}

void WriteData()

{

   FILE *fp;

   int emp_num;

   

   printf("\t\t You want to input the number of employees?:");

   scanf("%d",&emp_num);

   for(int i=0;i<emp_num;i++)

   {

      printf("\t\tPlease input employee name:");

      scanf("%s",emp[i].name);

 printf("\t\tPlease input employee ID:");

 scanf("%d",&emp[i].empID);

      printf("\t\tPlease input employee salary:");

 scanf("%f",&emp[i].salary);

 printf("\t\tPlease input employee post:");  // here occurred error

 scanf("%s",emp[i].post);

   }

   if((fp=fopen("EmployeeInfo.dat","ab"))==NULL) // open binary file 

   {

  printf("Can't open file\n");

  exit(1);

   }

   for(int j=0;j<emp_num;j++)

   {   

 if(fwrite(&emp[j],sizeof(struct EmployeeInfo),1,fp)!=1) //writing data to binary file

  printf("Error writing file.\n");

   }

   fclose(fp); // close file point

}

void DeleteEmployeeInfo()

{

int empID;

printf("Please enter the employee's ID to be deleted:");

scanf("%d",&empID);

/*

  here i want to delete the employee ID

*/

}