//=========================================================================
#define PROGRAMMER "SOLUTIONS, Nofrills"
#define PROG_CODE  "soln"
#define COURSE     "ECE-1021"
#define YEAR       (2004)
#define TERM       "Spring"
#define SECTION    (0)
#define ASSIGNMENT "HW5A"
#define REVISION   (0)
#define TITLE      "How much did that REALLY cost?"
#define SUBTITLE   "Last modified on 12 MAR 04"
#define EMAIL      "ece1021@eas.uccs.edu"
#define FILENAME   "05a0soln.c"
//=========================================================================

// NOTE: This file was prepared using the new template.c

//=========================================================================
// PROBLEM
//=========================================================================

// Generate an amortization table for a credit card on which a single
// purchase is made and which is paid back according to the minimum payment
// terms of the card.

//=========================================================================
// PSEUDOCODE (top levels only)
//=========================================================================

// 1. TASK: Get Input Data from User.
//
// 2. TASK: Generate a Month-by-Month Table until item is paid off.
// 2.1. TASK: Output Table Header (first row of table)
// 2.2. TASK: Initialize variables for first month
// 2.3. TASK: Initialize variable for running totals
// 2.4. WHILE (balance > 0)
// 2.4.1. TASK: Update variables for that month's activity
// 2.4.2. TASK: Update running totals
// 2.4.3. TASK: Print out activity for that month
//
// 3. TASK: Generate a Final Summary after the item is paid off.

//=========================================================================
// DEVIATIONS FROM SUBMITTED PSEUDOCODE
//=========================================================================
//
// Change: (See pseudocode task 2.2.2)
// Was SET: new_balance = 0.0
// Now SET: new_balance = purchase
//
// Reason For Change:
// Careless mistake in typing pseudocode.
//
// Change: (See pseudocode task 2.4)
// The main loop test was (balance > 0)
// It has been changed to (balance > 0.005)
//
// Reason For Change:
// The account is considered paid off once less than one cent is owed.
// Otherwise, the program keeps expecting payments until the balance
// finally underflows (i.e., gets smaller than ~1e-308).

//=========================================================================
// WAIVED COMPILER WARNINGS
//=========================================================================
//
// Linker Warning: No module definition file specified: using defaults
// Reason for Waiver: Can't suppress. Does not have adverse impact.

//=========================================================================
// CODE SECTION
//=========================================================================

//== INCLUDE FILES ========================================================
#include <stdio.h> // printf()

//== MACRO DEFINITIONS ====================================================
#define FALSE (0)
#define TRUE (!FALSE)
#define BLANKLINE printf("\n")

//== FUNCTION PROTOTYPES (for Primary Functions) ==========================
void PrintHeader(void);

//== MAIN FUNCTION ========================================================
int main(void)
{
	double price;
	double apr;
	double min_percentage, abs_minimum_pmt;

	int month;
	double old_balance, new_balance, interest, payment, minimum_due;

	double TotalFinanceCost, TotalCost;

	PrintHeader();
	BLANKLINE;

	//-----------------------------------------------------------------
	// 1. TASK: Get Input Data from User.
	//-----------------------------------------------------------------
	printf("Enter the purchase price (in $): ");
	scanf("%lf", &price);
	printf("Enter the Annual Percentage Rage (in %): ");
	scanf("%lf", &apr);
	apr /= 100.0;
	printf("Enter the Minimum Payment Percentage (in %): ");
	scanf("%lf", &min_percentage);
	min_percentage /= 100.0;
	printf("Enter the Minimum Payment (in $): ");
	scanf("%lf", &abs_minimum_pmt);

	//-----------------------------------------------------------------
	// 2. TASK: Generate a Month-by-Month Table until item is paid off.
	//-----------------------------------------------------------------

	// 2.1. TASK: Output Table Header (first row of table)
	BLANKLINE;
	BLANKLINE;
	printf("MONTH BY MONTH ACTIVITY\n");
	BLANKLINE;
	printf(" MONTH ");
	printf(" OLD BAL ");
	printf(" FIN CHG ");
	printf(" PAYMENT ");
	printf(" NEW BAL ");
	printf(" MIN DUE ");
	printf("\n");

	// 2.2. TASK: Initialize variables for first month
	month = -1;
	new_balance = price;
	minimum_due = 0.0;

	// 2.3. TASK: Initialize variable for running totals
	TotalFinanceCost = 0.0;
	TotalCost = 0.0;

	while (new_balance > 0.005)
	{
		// 2.4.1. TASK: Update variables for that month's activity
		month++;
		old_balance = new_balance;
		interest = old_balance * apr * (1.0/12.0);
		payment = minimum_due;
		new_balance = old_balance + interest - payment;

		// 2.4.1.6. TASK: Set Minimum Payment
		if(new_balance > abs_minimum_pmt)
		{
			minimum_due = new_balance * min_percentage;
			if(minimum_due < abs_minimum_pmt)
				minimum_due = abs_minimum_pmt;
		}
		else
			minimum_due = new_balance;

		// 2.4.2. TASK: Update running totals
		TotalFinanceCost += interest;
		TotalCost += payment;

		// 2.4.3. TASK: Print out activity for that month
		printf(" %4i ", month);
		printf(" %8.2f", old_balance);
		printf(" %8.2f", interest);
		printf(" %8.2f", payment);
		printf(" %8.2f", new_balance);
		printf(" %8.2f", minimum_due);
		printf("\n");
	}

	//-----------------------------------------------------------------
	// 3. TASK: Generate a Final Summary after the item is paid off.
	//-----------------------------------------------------------------

	BLANKLINE;
	BLANKLINE;
	printf("SUMMARY\n");
	BLANKLINE;
	printf("Number of Months required to pay off: %5i\n", month);
	printf("Original Purchase Price: ....    $%9.2f\n", price);
	printf("Total Finance Charges: ...... +   %9.2f\n", TotalFinanceCost);
	printf("Total Cost of Item: ......... =  $%9.2f\n", TotalCost);

	return(0);
}

//=========================================================================
// PRIMARY FUNCTIONS (functions called directly by main() )
//=========================================================================

//== FUNCTION PROTOTYPES (for Support Functions) ==========================
int printc(char c, int n);

//== PRIMARY FUNCTIONS ====================================================
void PrintHeader(void)
{
	printc('=', 79); printf("\n");
	printf("Course....... %s-%i (%s %i)\n", COURSE, SECTION, TERM, YEAR);
	printf("Programmer... %s (%s)\n", PROGRAMMER, PROG_CODE);
	printf("Assignment... %s (Rev %i) (Source Code in %s)\n",
		ASSIGNMENT, REVISION, FILENAME);
	printf("Description.. %s\n", TITLE);
	printf("              %s\n", SUBTITLE);
	printc('=', 79); printf("\n");

	return;
}

//=========================================================================
// SUPPORT FUNCTIONS (functions not called directly by main() )
//=========================================================================

int printc(char c, int n)
{
	while(0 < n--)
		printf("%c", c);

	return(n);
}