//********************************************************
//
// Assignment 6 - Structures
//
// Name: Anthony Principe
//
// Class: C Programming, Fall 2025
//
// Date: October 19, 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
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);
float calcOvertime (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); 
 
       // Calculate overtime hours
       employeeData[i].overtimeHrs = calcOvertime (employeeData[i].hours);
 
       // Calculate gross pay
       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: calcOvertime
// 
// Purpose: Calculates overtime hours based on hours worked
// 
// Parameters: hours - hours worked in the week
// 
// Returns: overtimeHrs - hours worked over 40
//  
//**************************************************************
 
float calcOvertime (float hours)
{
    float overtimeHrs;
 
    if (hours > STD_HOURS)
        overtimeHrs = hours - STD_HOURS;
    else
        overtimeHrs = 0.0;
 
    return overtimeHrs;
} // calcOvertime
 
 
//**************************************************************
// Function: calcGross
// 
// Purpose: Calculates the gross pay for an employee
// 
// Parameters: wageRate - hourly pay rate
//             hours - total hours worked
//             overtimeHrs - hours worked over 40
// 
// Returns: grossPay - total pay for the week
//  
//**************************************************************
 
float calcGross (float wageRate, float hours, float overtimeHrs)
{
    float grossPay;
 
    if (hours <= STD_HOURS)
        grossPay = hours * wageRate;
    else
        grossPay = (STD_HOURS * wageRate) + (overtimeHrs * wageRate * OT_RATE);
 
    return grossPay;
} // calcGross
 
 
//**************************************************************
// Function: printHeader
// 
// Purpose: Prints the initial table header information.
// 
// Parameters: none
// 
// Returns: void
//  
//**************************************************************
 
void printHeader (void) 
{ 
    printf ("\n\n*** Pay Calculator ***\n");     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("%06li   %5.2f   %5.1f   %5.1f   %8.2f\n",           clockNumber, wageRate, hours, overtimeHrs, grossPay);
}  // printEmp