CSC 111

Solving Problems with Computers

Java Programming: From Problem Analysis to Program Design, Third Edition 3

Solving Problems Stages

1. Problem Definition Define the main Problem

Java Programming: From Problem Analysis to Program Design, Third Edition 4

Problem Definition Write a Program to Print the Sum of two integer Numbers

Write a program to Print the Average of three integer numbers

Write a program to print the volume of a cube and the sum of it’s surfaces’ areas

Java Programming: From Problem Analysis to Program Design, Third Edition 5

Solving Problems Stages

1. Problem Definition Define the main Problem

2. Problem Analysis Determine the inputs, outputs,

Arithmetic & logic operations

Java Programming: From Problem Analysis to Program Design, Third Edition 6

Problem Analysis Write a Program to Print the Sum of two integer

NumbersInputs :

1. First Number2. Second Number

Operations : Summation = first + second

Output :1. The summation

Java Programming: From Problem Analysis to Program Design, Third Edition 7

Problem Analysis Write a program to Print the Average of three

integer numbers

Inputs :1. First Number

2. Second Number

3. Third Number

Operations : Average = (first + second + third ) / 3

Output :1. The Average

Java Programming: From Problem Analysis to Program Design, Third Edition 8

Problem Analysis Write a program to print the volume of a cube and

the sum of it’s surfaces’ areas Inputs :1. Side Length

Operations : Volume = side * side * side Surface area = ( side * side ) * 6

Output :1. The Volume

2. The surface area

Java Programming: From Problem Analysis to Program Design, Third Edition 9

Solving Problems Stages

Problem Definition

Problem Analysis

Solution DesignDesign a solution for the problem by writing an algorithm or drawing a flow chart

Algorithm

Flow Chart

Java Programming: From Problem Analysis to Program Design, Third Edition 10

Basic steps for designing a solution

Read all the inputs

Calculate operations

Print the output

Java Programming: From Problem Analysis to Program Design, Third Edition 11

Algorithms Write a Program to Print the Sum of two integer Numbers

1. Start the program2. Read the first number and save in the variable ( N1 )3. Read the second number and save in the variable ( N2 )4. Sum the both numbers and save the result in the variable

( Sum ) Sum = N1 + N2 5. Print the variable ( Sum ) 6. End the program

Java Programming: From Problem Analysis to Program Design, Third Edition 12

Algorithms Write a program to Print the Average of three integer

numbers

1. Start the program2. Read the first number and save in the variable ( num1 )3. Read the second number and save in the variable ( num2 )4. Read the third number and save in the variable ( num3 )5. Sum the three numbers and save the result in the variable

( result ) result = num1 + num2 + num3

Java Programming: From Problem Analysis to Program Design, Third Edition 13

Algorithms Write a program to Print the Average of three

integer numbers

6. Divide the variable ( result ) by 3 and save the result in variable ( Average ) Average = result / 3

7. Print the variable ( Average )8. End the program

Java Programming: From Problem Analysis to Program Design, Third Edition 14

Algorithms Write a program to print the volume of a cube and

the sum of it’s surfaces’ areas

1. Start the program2. Read the length of the side and save in variable ( Length )3. Volume = Length * Length * Length4. Surface = ( Length * Length ) * 65. Print the variable ( Volume ) 6. Print the variable ( Surface )7. End the program

Java Programming: From Problem Analysis to Program Design, Third Edition 15

Flow Chart

Java Programming: From Problem Analysis to Program Design, Third Edition 16

Loops

Start/End

Read/Print

Arithmetic Operations

Decision

Connectors arrows

Connectors points

Comments

Flow chart’s Symbols

Start

Read n1

N2 = 5

End

Print n1

N2 = n1+3

n1 > 3

//my name

Simple Sequential Flow Charts

start

End

Java Programming: From Problem Analysis to Program Design, Third Edition 18

Write a Program to Print the Sum of two integer Numbers

1. Start the program2. Read the first number and save in

the variable ( N1 )3. Read the second number and save in

the variable ( N2 )4. Sum the both numbers and save the

result in the variable ( Sum ) Sum = N1 + N2

5. Print the variable ( Sum ) 6. End the program

start

Read N1

Read N2

Sum = N1 + N2

Print Sum

End

Java Programming: From Problem Analysis to Program Design, Third Edition 19

Write a program to print the volume of a cube and the sum of it’s surfaces’ areas

1. Start the program2. Read the length of the side and save

in variable ( Length )3. Volume = Length * Length * Length4. Surface = ( Length * Length ) * 65. Print the variable ( Volume ) 6. Print the variable ( Surface )7. End the program

start

Read L

�ٍSurface = ( L * L ) * 6

Print Volume

End

Volume = L * L * L

Print Surface

Java Programming: From Problem Analysis to Program Design, Third Edition 20

Write a program to Print the Average of three integer numbers

start

Read num1

Read num2

result = num1+num2+num3

Print Average

End

Read num3

Average = result/3

start

Read num1,num2,num3

result = num1+num2+num3

Print Average

End

Average = result/3

or

Java Programming: From Problem Analysis to Program Design, Third Edition 21

Write a program to Print the Average of three integer numbers

start

Read num1,num2,num3

Average = ( num1+num2+num3 ) / 3

Print Average

End

or

Java Programming: From Problem Analysis to Program Design, Third Edition 22

Write a program to Print the Average of three integer numbers

start

Read num1

Read num2

Print Average

End

Read num3

Average = result/3

result = num1+num2+num3

start

Read num3

Read num1

result = num1+num2+num3

Print Average

End

Read num2

Average = result/3

Java Programming: From Problem Analysis to Program Design, Third Edition 23

Write a program to Print the Average of three integer numbers

start

Read num1,num2,num3

result = num1+num2+num3

Print result

End

Average = result/3

start

Read num1,num2,num3

Print result

End

Average = result/3

result = num1+num2+num3

Print Average