#include <stdio.h>

// constants
#define SIZE 5
#define OVERTIME_RATE 1.5f
#define STD_WORK_WEEK 40.0f

// function prototypes
float getHours (long int clockNumber);
void printHeader (void);
void printEmp  (long int clockNumber, float wageRate, float hours,
                float overtimeHrs, float grossPay);

// Other required function prototypes
float calculateOvertime (float hours);
float calculateGrossPay (float wageRate, float hours, float overtimeHrs);

int main()
{
    /* Variable Declarations */
    long  int clockNumber[SIZE] = {98401, 526488, 765349, 34645, 127615}; // ID
    float grossPay[SIZE];     // gross pay
    float hours[SIZE];        // hours worked in a given week
    int   i;                  // loop and array index
    float overtimeHrs[SIZE];  // overtime hours
    float wageRate[SIZE] = {10.60, 9.75, 10.50, 12.25, 8.35}; // hourly wage rate

    // process each employee
    for (i = 0; i < SIZE; ++i)
    {
        // Read in hours for employee
        hours[i] = getHours (clockNumber[i]); 

        // Function call to calculate overtime hours
        overtimeHrs[i] = calculateOvertime (hours[i]);

        // Function call to calculate gross pay
        grossPay[i] = calculateGrossPay (wageRate[i], hours[i], overtimeHrs[i]);
    }

    // print the header info
    printHeader();

    // print out each employee
    for (i = 0; i < SIZE; ++i)
    {
        // Print all the employees - call by value
        printEmp (clockNumber[i], wageRate[i], hours[i],
                   overtimeHrs[i], grossPay[i]);
    } 

    return (0);
} 

//**************************************************************
// Function: getHours 
// Purpose: Obtains input from user for hours worked per employee
//**************************************************************
float getHours (long int clockNumber) 
{
    float hoursWorked;
    printf("Enter hours worked for clock #%ld: ", clockNumber);
    scanf("%f", &hoursWorked);
    return hoursWorked;
}

//**************************************************************
// Function: calculateOvertime
// Purpose: Computes the number of hours worked past 40
//**************************************************************
float calculateOvertime (float hours) 
{
    if (hours > STD_WORK_WEEK) 
    {
        return hours - STD_WORK_WEEK;
    }
    return 0.0f;
}

//**************************************************************
// Function: calculateGrossPay
// Purpose: Calculates regular pay and adds 1.5x overtime pay
//**************************************************************
float calculateGrossPay (float wageRate, float hours, float overtimeHrs) 
{
    float regularHours = hours - overtimeHrs;
    float regularPay = regularHours * wageRate;
    float overtimePay = overtimeHrs * (wageRate * OVERTIME_RATE);
    
    return regularPay + overtimePay;
}

//**************************************************************
// Function: printHeader
// Purpose: Prints the table column headers
//**************************************************************
void printHeader (void)
{
    printf("\n--------------------------------------------------------------\n");
    printf("%-10s %-10s %-10s %-12s %-10s\n", 
           "Clock #", "Wage Rate", "Hours", "OT Hours", "Gross Pay");
    printf("--------------------------------------------------------------\n");
}

//**************************************************************
// Function: printEmp
// Purpose: Prints aligned fields for a single employee record
//**************************************************************
void printEmp (long int clockNumber, float wageRate, float hours,
                float overtimeHrs, float grossPay)
{
    printf("%-10ld $%-9.2f %-10.1f %-12.1f $%-9.2f\n", 
           clockNumber, wageRate, hours, overtimeHrs, grossPay);
}