/*
 * structure4.c - writing structure data to a file
 */
#include <stdio.h>
#include <stdlib.h>

int getans(void); // prototype getans: takes nothing, returns int

int main(void) // header of funciton main
{
  struct EmpInfo // declare struct with 6 elements
  {
    char first[20];
    char last[20];
    char phone[20];
    char email[30];
    int sal;
    int yearhired;
  }; // don't forget the semicolon 
 
  int ii, jj; // declare counters
  struct EmpInfo emp[20]; // declare array of 20 elements, of type struct EmpInfo

  char filename[20]; // char array to hold name of data file
  FILE * fp; // declare file pointer named fp
  printf("Enter the name of the database for employees: ");
  scanf("%s", filename);
  
  for(ii=0; (ii ? getans() : 1); ii++ ) // initialize ii to zero
                                        // Conditiona: evaluate if ii is TRUE
                                        // if TRUE, call getans() and evalueat returned result  
                                        // else return 1, and evaluate.
                                        // If the outcome is TRUE, do block
                                        // incremnt ii  
  {
    printf("Enter employee's first name: ");
    scanf("%s", emp[ii].first); // read from stdin, store in array at &emp[ii].first[0]
    
    printf("Enter employee's last name: ");
    scanf("%s", emp[ii].last); // read from stdin , store in arry at &emp[ii].last[0]
  
    printf("Enter employee's phone number: "); 
    scanf("%s", emp[ii].phone); // read from stdin , store in arry at &emp[ii].phone[0]

    printf("Enter employee's email address: ");
    scanf("%s", emp[ii].email);  // read from stdin , store in arry at &emp[ii].email[0]

    printf("Enter employee's salary: ");
    scanf("%d", &emp[ii].sal); // read from stdin , store in int at &emp[ii].sal

    printf("Enter the year the employee was hired: ");
    scanf("%d", &emp[ii].yearhired);

    getchar(); // clear input buffer
  }  // end input loop

  if( (fp=fopen( filename, "a"))==NULL)
  {
    printf("Can't open file: %s\n", filename);
    exit(1);
  }
  printf("\n\n");
  
  for(jj=0; jj<ii; jj++)
  {
    fprintf(fp, "Employee [NAME]:%s %s\t", emp[jj].first, emp[jj].last);
    fprintf(fp, "[SALARY]:%d\t[YEARHIRED]:%d\n", emp[jj].sal,emp[jj].yearhired);
    fprintf(fp, "Employee [PHONE]:%s\t[EMAIL]:%s\n\n", emp[jj].phone, emp[jj].email);
  }
  fclose(fp);
  printf("File %s is written and closed.\n", filename);
  return 0;
}
  
int getans(void) // header for function getans: takes nothing, returns int
{
  char cc;
  
  printf("\nPress 'q' to quit, any other key to continue: ");
  
  cc=getchar();
  
  if( cc=='q' )
  {
    return 0;
  }
  else
  {
    while( getchar() != '\n');
    return 1;
  }
}