Problem Solving (Lab 2)

Assalamualaikum and Hi guys ! This is my third lab task where I need to trace a given program, designing solution to a problem using Problem Analysis Chart (PAC) and Input Process Output Chart (IPO) and to write, compile and run a simple computer program based on IPO.

So, Let's Start !!

This is the first question for this Lab 2 task where I need to type all this source code in the windows prompt, compile the code and run it. For each problems, it has different types of error where I need to trace and fix it. Below are the given problems:

Question 1: Problem 1:

There is no error found in the above problem. Here is the answer for the first problem;

Problem 2:

For Problem 2, what I found is the printed result is wrong where the answer should be 1.5 but the printed result is 1.0. So, the traced error here is the data type using in the problem 2 is not suitable. The proper data type should be used is "double" for "number 1" and "number 2" , hence it can store large memory.

Answer:

Problem 3:

The error in the above problem is about the formula inserted in the command prompt. The formula used is wrong and it produced the wrong result. Below is the correct answer for the Problem 3:

Answer:

Problem 4:

The error for problem 4 is also about the data type that had been used. The "int" in front of "tax" in line 6 should be replaced with "double".

Answer:

Question 2:

Average :

I spot that there is a logic error in the coding for average class. Number1 and Number2  should be in the correct numerical data type, so that the memory can read the value. The answer for average class should be 1.5 but the result produced by the programmer is 1.0.

FahrenheitToCelsius:

I spot logic error for Fahrenheit class where the result produced by programmer is doesn’t same as what we command. From my observation, I found that maybe there is mistake in writing the formula. So after I correct the formula, I get the exact answer.

Question 3:

For question 3, I try solve the problem by using "Math.round" to round up the values. Below is the answer for question 3:

Question 4:

Question 4 is about how I try to develop the program by myself for each data type available in Java. Below is one of the data types available in Java program.

Answer :

Double

Question 5:

Answer :

•      PAC

DATA	PROCESSING	OUTPUT
Amount of money	Ringgit = (int)amount; Sen = (amount – Ringgit) * 100	Amount of money in Ringgit Amount of money in Sen

• IPO

DATA	PROCESSING	MODULE	OUTPUT
Amount of money	Get amount from user input. Ringgit = (int)amount; Sen = (amount – Ringgit) * 100		Amount of money in Ringgit Amount of money in Sen

• ALGORITHM:

1.       Get the amount from user

2.       Convert the amount into Ringgit and Sen by using the following formula:

Ringgit = (int) amount;

Sen = (amount – Ringgit) * 100

3.       Display the amount in Ringgit and Sen.

•      Java Program

Question 6:

Answer :

•       PAC

DATA	PROCESSING	OUTPUT
Weight in pounds Height in inches	Convert weight in pounds to weight in kilograms Convert height in inches to height in meters Weight = weight in pounds * 0.45359237 kg Height = height in inches * 0.0254 meter Compute BMI BMI = weight / height2	Display BMI

• IPO

DATA	PROCESSING	MODULE	OUTPUT
Weight in pounds Height in inches	Get value of weight and height from user input. Convert weight in pounds to weight in kilograms Convert height in inches to height in meters Weight = weight in pounds * 0.45359237 kg Height = height in inches * 0.0254 meter Compute BMI BMI = weight / height2		Display BMI

• ALGORITHM:

1.       Get value of weight and height from user input.

2.       Convert weight in pounds to weight in kilograms  by using the following formula:

Weight = weight in pounds * 0.45359237 kg

3.       Convert height in inches to height in meters by using the following formula:

Height = height in inches * 0.0254 meter

4.       Display the BMI.

• JAVA program

For each Lab task, there is different problem and level of tough. So stay tuned with me :)

Nursaidatul Sakinah Binti Saharuddin

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