/* * File: empdb.c * ------------- * This program tests the functions defined for employees * collected into a database. */#include <stdio.h>#include "genlib.h"#include "strlib.h"#include "simpio.h"/* * Constants * --------- * MaxEmployees -- Maximum number of employees */#define MaxEmployees 100/* * Type: employeeT * --------------- * This structure defines the fields for an employee. */typedef struct {    string name;    string title;    string ssnum;    double salary;    int withholding;} *employeeT;/* * Type: employeeDB * ---------------- * This structure represents an entire database of employees. */typedef struct {    employeeT staff[MaxEmployees];    int nEmployees;} *employeeDB;/* Private function declarations */static employeeDB ReadEmployeeDatabase(void);static employeeT ReadOneEmployee(void);static void ListEmployees(employeeDB db);static void GiveRaise(employeeDB db);static double AverageSalary(employeeDB db);/* Main program */main(){    employeeDB db;    db = ReadEmployeeDatabase();    ListEmployees(db);    printf("Average salary = %g\n", AverageSalary(db));    GiveRaise(db);    printf("Average after raises = %g\n", AverageSalary(db));}static employeeDB ReadEmployeeDatabase(void){    employeeDB db;    employeeT emp;    int nEmployees;    db = New(employeeDB);    nEmployees = 0;    printf("Enter employee data (use blank name to stop).\n");    while ((emp = ReadOneEmployee()) != NULL) {        db->staff[nEmployees] = emp;        nEmployees++;    }    db->nEmployees = nEmployees;    return (db);}/* * Function: ReadOneEmployee * Usage: emp = ReadOneEmployee(); * ------------------------------- * This function reads in the data for a single employee * and returns the structure pointer as a value of type * employee.  If the user types in a blank line as the * name, the function treats this as a "no more data" * indicator and returns the value NULL. */static employeeT ReadOneEmployee(void){    employeeT emp;    string name;    printf("Name: ");    name = GetLine();    if (StringLength(name) == 0) return (NULL);    emp = New(employeeT);    emp->name = name;    printf("Title: ");    emp->title = GetLine();    printf("SSNum: ");    emp->ssnum = GetLine();    printf("Salary: ");    emp->salary = GetReal();    printf("Withholding: ");    emp->withholding = GetInteger();    return (emp);}static void ListEmployees(employeeDB db){    int i;    for (i = 0; i < db->nEmployees; i++) {        printf("%s (%s)\n", db->staff[i]->name,                            db->staff[i]->title);    }}static void GiveRaise(employeeDB db){    int i;    for (i = 0; i < db->nEmployees; i++) {        if (db->staff[i]->withholding >= 5) {            db->staff[i]->salary *= 2;        }    }}static double AverageSalary(employeeDB db){    double total;    int i;    total = 0;    for (i = 0; i < db->nEmployees; i++) {        total += db->staff[i]->salary;    }    return (total / db->nEmployees);}