1. CSC 111 http://csc111.wordpress.com

2. Solving Problems with Computers

3. Solving Problems Stages
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
Problem Definition
Define the main Problem
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 Numbers
Inputs :
First Number
Second Number
Operations :
Summation = first + second
Output :
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 :
First Number
Second Number
Third Number
Operations :
Average = (first + second + third ) / 3
Output :
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 :
Side Length
Operations :
Volume = side * side * side
Surface area = ( side * side ) * 6
Output :
The Volume
The surface area
Java Programming: From Problem Analysis to Program Design, Third Edition

9. Solving Problems Stages
Problem Definition
Algorithm
Problem Analysis
Solution Design
Design a solution for the problem by writing an algorithm or drawing a flow chart
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
Start the program
Read the first number ( N1 )
Read the second number ( N2 )
Sum the both numbers in ( Sum )  Sum = N1 + N2
Print the variable ( Sum )
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
Start the program
Read the first number ( num1 )
Read the second number ( num2 )
Read the third number ( num3 )
Sum the three numbers in ( 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
Divide the ( result ) by 3 and save the result in ( Average )  Average = result / 3
Print the ( Average )
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
Start the program
Read the length of the side ( Length )
Volume = Length * Length * Length
Surface = ( Length * Length ) * 6
Print the ( Volume )
Print the ( Surface )
End the program
Java Programming: From Problem Analysis to Program Design, Third Edition

15. Organization of Instructions
Instructions that describe behavior can be organized in three ways in most programming languages:
Sequentially
Conditionally (Selection)
Repetitively
Java Programming: From Problem Analysis to Program Design, Third Edition

16. Conditionally (Selection)
Sequentially
Conditionally (Selection)
Repetitively
Java Programming: From Problem Analysis to Program Design, Third Edition

17. Flow Charts
Java Programming: From Problem Analysis to Program Design, Third Edition

18. Flow chart’s Symbols Start/End End Start Read/Print Print n1 Read n1
Arithmetic Operations
N2 = n1+3
N2 = 5
Decision
n1 > 3
Loops
Connectors arrows
Connectors points
Comments
// my name
Java Programming: From Problem Analysis to Program Design, Third Edition

19. Simple Sequential Flow Charts
start
End

20. Write a Program to Print the Sum of two integer Numbers
start
Start the program
Read the first number ( N1 )
Read the second number ( N2 )
Sum the both numbers in ( Sum )  Sum = N1 + N2
Print the ( Sum )
End the program
Read N1
Read N2
Sum = N1 + N2
Print Sum
End
Java Programming: From Problem Analysis to Program Design, Third Edition

21. Read the length of the side ( Length )
Write a program to print the volume of a cube and the sum of it’s surfaces’ areas
start
Start the program
Read the length of the side ( Length )
Volume = Length * Length * Length
Surface = ( Length * Length ) * 6
Print the ( Volume )
Print the ( Surface )
End the program
Read L
Volume = L * L * L
ٍSurface = ( L * L ) * 6
Print Volume
Print Surface
End
Java Programming: From Problem Analysis to Program Design, Third Edition

22. Write a program to Print the Average of three integer numbers
start or
Read num1
start
Read num2
Read num1,num2,num3
Read num3
result = num1+num2+num3
result = num1+num2+num3
Average = result/3
Average = result/3
Print Average
Print Average
End
End
Java Programming: From Problem Analysis to Program Design, Third Edition

23. Write a program to Print the Average of three integer numbersor
start
Read num1,num2,num3
Average = ( num1+num2+num3 ) / 3
Print Average
End
Java Programming: From Problem Analysis to Program Design, Third Edition

24. Write a program to Print the Average of three integer numbers
start
start
result = num1+num2+num3
Read num3
Read num1
Read num1
Read num2
Read num2
result = num1+num2+num3
Read num3
Average = result/3
Average = result/3
Print Average
Print Average
End
End
Java Programming: From Problem Analysis to Program Design, Third Edition

25. Write a program to Print the Average of three integer numbers
start
start
Read num1,
num2,num3
Read num1,
num2,num3
result = num1+num2+num3
Average = result/3
Average = result/3
result = num1+num2+num3
Print result
Print Average
Print result
End
End
Java Programming: From Problem Analysis to Program Design, Third Edition