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Solving Problems with Computers

Solving Problems with Computers. Solving Problems Stages. Problem Definition Define the main Problem. Problem Definition. Write a Program to Print the Sum of two integer Numbers Write a program to Print the Average of three integer numbers

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Solving Problems with Computers

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  1. Solving Problems with Computers

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

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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

  9. 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

  10. 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

  11. 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

  12. 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

  13. 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

  14. 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

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

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

  17. Flow chart’s Symbols End Start Print n1 Read n1 N2 = n1+3 N2 = 5 n1 > 3

  18. start Simple Sequential Flow Charts End

  19. 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

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

  21. 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

  22. 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

  23. 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

  24. 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

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