//********************************************************
//
// Assignment 6 - Structures
//
// Name: John Eneh
//
// Class: C Programming, Fall 2025
//
// Date: 10/18/2025
//
// Description: Program which determines overtime and 
// gross pay for a set of employees with outputs sent 
// to standard output (the screen).
//
// Call by Value design
//
//********************************************************
 
// Define and Includes
 
#include <stdio.h>
 
// Define Constants
#define SIZE 5
#define STD_HOURS 40.0
#define OT_RATE 1.5
 
// Define a global structure to pass employee data between functions
// Note that the structure type is global, but you don't want a variable
// of that type to be global. Best to declare a variable of that type
// in a function like main or another function and pass as needed.
 
struct employee
{
    long int clockNumber;
    float wageRate;
    float hours;
    float overtimeHrs;
    float grossPay;
};
 
// define prototypes here for each function except main
float getHours (long int clockNumber);
void printHeader (void);
void printEmp (long int clockNumber, float wageRate, float hours,
               float overtimeHrs, float grossPay);
 
// Same prototypes as last week's assignment
float calcOT (float hours);                                         
float calcGross (float wageRate, float hours, float overtimeHrs);
 
int main ()
{
    // Set up a local variable to store the employee information
    struct employee employeeData[SIZE] = {
        { 98401, 10.60 },
        { 526488, 9.75 },
        { 765349, 10.50 }, // initialize clock and wage values
        { 34645, 12.25 },
        { 127615, 8.35 }
    };
 
    int i;  // loop and array index
 
    // Call functions as needed to read and calculate information
    for (i = 0; i < SIZE; ++i) 
    { 
 
       // Prompt for the number of hours worked by the employee
       employeeData[i].hours = getHours (employeeData[i].clockNumber); 
 
       // calcOT for overtime. Adapted from last week
       employeeData[i].overtimeHrs = calcOT (employeeData[i].hours);
 
       // calcGross for gross pay. Adapted from last week
       employeeData[i].grossPay = calcGross (employeeData[i].wageRate, 
    						employeeData[i].hours, employeeData[i].overtimeHrs); 
 
    } // for
 
    // Print the column headers
    printHeader();
 
    // print out each employee
    for (i = 0; i < SIZE; ++i) 
    { 
        printEmp (employeeData[i].clockNumber, 
                  employeeData[i].wageRate, 
                  employeeData[i].hours,
                  employeeData[i].overtimeHrs, 
                  employeeData[i].grossPay);
    }
 
    return(0); // success
 
} // main
 
//**************************************************************
// Function: getHours 
// 
// Purpose: Obtains input from user, the number of hours worked 
// per employee and stores the result in a local variable 
// that is passed back to the calling function. 
// 
// Parameters: clockNumber - The unique employee ID
// 
// Returns: hoursWorked - hours worked in a given week
//  
//**************************************************************
 
float getHours (long int clockNumber) 
{ 
 
    float hoursWorked; // hours worked in a given week
 
    // Read in hours for employee
    printf("\nEnter hours worked by emp # %06li: ", clockNumber
);      scanf ("%f", &hoursWorked
);   
    // return hours back to the calling function
    return (hoursWorked);
 
} // getHours
 
//**************************************************************
// Function: calcOT
// 
// Purpose: takes the value of hours and determines if they 
// exceed the 40 hours of the stantdard work week
// and then passes the overtime back to the calling function. 
// 
// Parameters: 
//	hours - Hours worked for the week
//	STD_HOURS - 40 hours in the work week 
// 
// Returns: 
//  overtime hours - the calculated hours beyond 40. Returns
//  0 if hours do not exceed 40.
//  
//**************************************************************
 
float calcOT (float hours) 
{	
	if (hours > STD_HOURS)
	{
		return (hours - STD_HOURS);
	}
	else
	{
		return (0);
	}
 
} // calcOT
//**************************************************************
// Function: calcGross
// 
// Purpose: calculates the gross pay using the employees'
// wageRate, hours worked, and OT hours if any are available.
// Passes the calculated the amount to main. 
// 
// Parameters: 
//	wageRate - Employees' payrate
//  hours - Hours worked for the week
//	STD_HOURS - 40 hours in the work week 
//  overtimeHrs - Hours worked beyond 40 hours
// 
// Returns: gross pay - normal pay + available OT pay
//  
//**************************************************************
 
float calcGross (float wageRate, float hours, float overtimeHrs) 
{	
	if (hours > STD_HOURS)
	{
		return ((STD_HOURS * wageRate) + (overtimeHrs * wageRate * OT_RATE));
	}
	else
	{
		return (wageRate * hours);
	}
} // calcGross
//**************************************************************
// Function: printHeader
// 
// Purpose: Prints the initial table header information.
// 
// Parameters: none
// 
// Returns: void
//  
//**************************************************************
 
void printHeader (void) 
{ 
 
    printf ("\n\n*** Pay Calculator ***\n");  
    // print the table header
    printf("\nClock# Wage  Hours  OT      Gross\n");     printf("------------------------------------------------\n");  
} // printHeader
 
 
//************************************************************* 
// Function: printEmp 
// 
// Purpose: Prints out all the information for an employee
// in a nice and orderly table format.
// 
// Parameters: 
//
//     clockNumber - unique employee ID
//     wageRate - hourly wage rate
//     hours - Hours worked for the week
//     overtimeHrs - overtime hours worked in a week
//     grossPay - gross pay for the week
// 
// Returns: void
//  
//**************************************************************
 
void printEmp (long int clockNumber, float wageRate, float hours,
                float overtimeHrs, float grossPay)
{
 
    // Print out a single employee
    printf("\n %06li %5.2f %4.1f %4.1f %8.2f",           clockNumber, wageRate, hours,
          overtimeHrs, grossPay);
 
}  // printEmp