Computer Programming: Lab 2 Problem Solving Techniques

Today our class need to do our Lab 2 where we are required to trace a program, designing solution to a problem using Problem Analysis Chart (PAC) and Input Process Output (IPO) chart and run a simple program based on the IPO. I am very excited to do the first question at first until I get into Question 6. I am confused a bit for that question but I still manage to do it with the help from my classmates. So here we go ~..~

QUESTION 1
Trace the following programs and show their output:

a) Computer Area

b) Average

c) Fahrenheit To Celsius

d) Sales To Tax

QUESTION 2

Do you spot any error in the classes Average and/or FahrenheitToCelsius? Correct it.

a) Fahrenheit To Celsius

I fix the formula because the answer before is wrong due to wrong formula.

b) Average

I change the value 2 in double average formula to 2.0 so that I can get a precise answer which is in the decimal point.

QUESTION 3

I change the line 8 from (int) to (double) so that I can get an answer that rounded up to 3 decimal places.

QUESTION 4

Write a program that declares variables and assign values from a user for each data type available in Java and print them out.

I choose several classes which is Boolean, Character, Double and Float:

a) Boolean

b) Character

c) Double

d) Float

QUESTION 5
Develop a program that changes a given amount of money into smaller monetary units. The program lets the user enter an amount as double value representing an amount in RM and sen, and outputs a report listing the number of RM and sen.

a) PAC, IPO and Algorithm

PAC
Input	Process	Output
Amount	Convert amount entered to ringgit and sen	Display amount in ringgit and sen
IPO
Input	Process	Output
Amount = 11.56	Enter amount double ringgit = (int)amount double sen = amount – ringgit Display amount in ringgit and sen End	Display amount in ringgit and sen
ALGORITHM

b) Complete JAVA program and solve the problem.

QUESTION 6

Body Mass Index (BMI) is a measure of health on weight. It can be calculated by taking your weight in kilograms and dividing, by the square of your height in meters. Write a program that prompts a user to enter a weight in pounds and height in inches and displays the BMI. 1 pound is 0.45359237 kilograms and one inch is 0.0254.

a) PAC, IPO and Algorithm

PAC
Input	Process	Output
Weight; Height	Convert weight in pounds to kilogram and height in inches to metres and calculate BMI	Display BMI
IPO
Input	Process	Output
Weight; Height	Enter weight in pounds Enter height in inches double weight = pounds x 0.45359237 double height = inches x 0.0254 double BMI = weight / height / height Display BMI End	Display BMI
ALGORITHM