PROBLEM

We are going to write a program that computes a customer's electricity bill. The rate of charge for the first 200 unit of electricity used is RM0.218. For the following unit of electricity used is RM0.334. A penalty of 1.5% of the unpaid balance if the unpaid balance is greater than zero. Electricity unit, unpaid balance are inputted by user.

SOLUTION

PROGRAM DATA REQUIREMENT

List of data required in this problem. There are three (3) categories of data.

Constants

RATELESS 0.218 /* rate of charge first 200 unit */

RATEMORE 0.334 /* rate of charge following unit */

PEN 0.015 /* penalty for unpaid balance */

Inputs

int unit /* unit of electricity used */

float UnpaidBal /* unpaid balance */

Outputs

float Penalty /* charge of penalty */

float UseCharge /* charge for the current electricity use */

float TotalBill /* total charge */

PROGRAM ALGORITHM (FLOW OF PROGRAM)

1. Display user instructions

2. Get data: unpaid balance and electricity unit used

3. Determine electricity unit used and compute use charge

4. Determine unpaid balance and compute penalty

5. Compute total charge

6. Display the total bill amount

DESIGN OF COMPUTATION OF USE CHARGE

The data required to compute the use charge are listed. We separate the involved data categories into Input, Process and Output.

Input Data

int unit /* unit of electricity used */

Process Data

RATELESS 0.218 /* rate of charge first 200 unit */

RATEMORE 0.334 /* rate of charge following unit */

Output Data

float UseCharge /* charge for the current electricity use */

Algorithm for Computation of Use Charge

We know that different rate will be used if the electricity unit used is more than 200. Thus we use if else selection to design the algorithm.

if unit > 200

compute use charge for more than 200 unit

else

compute use charge for less than 200 unit

Formula for Use Charge

UseCharge=(unit-200)*RATEMORE+200*RATELESS /* more than 200 */

UseCharge=unit*RATELESS /* less than 200 */

DESIGN OF COMPUTATION OF PENALTY

The data required to compute the penalty are listed. We separate the involved data categories into Input, Process and Output.

Input Data

float UnpaidBal /* unpaid balance */

Process Data

PEN 0.015 /* penalty for unpaid balance */

Output Data

float Penalty /* charge of penalty */

Algorithm for Computation of Penalty

Penalty is dealt when there is an unpaid balance. We use if selection to design the algorithm.

if unpaid balance > 0

compute penalty

Formula for Penalty

Penalty=PEN*UnpaidBal

DESIGN OF ELECTRICITY BILL LAYOUT

Displaying bill involves only input data (variables).

Input Data

float Penalty

float UnpaidBal

float UseCharge.

Algorithm for Displaying Bill

if unpaid balance > 0

compute penalty

IMPLEMENTATION

Begin by writing the #define directives for the constant data. In the main(), declare the input and output variables. Then start coding each program algorithm steps. Use printf() to display the user instruction/prompt and scanf() to read the user inputs (UnpaidBal and unit). Implement the computation of use charge and penalty using if else selection. Then, use relevant arithmetic operators to construct the formulas under their corresponding if else selection. Finally use comments in your program so as you won't get lost. Good luck and Happy Coding!

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