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Solving Problems with Computers

Solving Problems Stages Problem Definition Define the main Problem Java Programming: From Problem Analysis to Program Design, Third Edition

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Simple Sequential Flow Charts start End

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

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

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

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

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

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