{"id":707,"date":"2014-08-10T16:34:32","date_gmt":"2014-08-10T06:34:32","guid":{"rendered":"http:\/\/blogs.unsw.edu.au\/comp1400\/?p=707"},"modified":"2014-08-10T16:36:44","modified_gmt":"2014-08-10T06:36:44","slug":"lab-week-3-data-types-2","status":"publish","type":"post","link":"https:\/\/blogs.unsw.edu.au\/comp1400\/blog\/2014\/08\/lab-week-3-data-types-2\/","title":{"rendered":"Lab Week 3 – Data Types"},"content":{"rendered":"

Feedback on your progress<\/span><\/h2>\n

Each week, we will post several short quiz questions to encourage you to do some preparation before the lab. The intention of the quizzes is to give you quick feedback so that you know if you understand the material in the course so far and to encourage you to prepare for the labs by reading over the lecture material from the previous weeks.<\/p>\n

You should attempt the quizzes in your own time before the lab and bring your answers to your tutor, who will give you feedback. For now, quizzes are voluntary and we hope you’ll try them.<\/p>\n

This week’s quiz is here<\/a>.<\/p>\n

Lab Exercises<\/h2>\n

This week’s lab exercises are concerned with data types, which were introduced in last week’s lectures. You should attempt the exercises below using the\u00a0Tut3.zip<\/a> project for BlueJ.<\/p>\n

Data types<\/h3>\n

What\u00a0data type<\/strong> would you use to represent the following values? Why?<\/p>\n

    \n
  1. The length of a piece of string.<\/li>\n
  2. The number of students at UNSW.<\/li>\n
  3. A person’s age.<\/li>\n
  4. The mass of the sun.<\/li>\n
  5. The exact number of stars in the Milky Way.<\/li>\n
  6. The mathematical constant \u03c0.<\/li>\n<\/ol>\n

    Expressions<\/h3>\n

    What are the\u00a0value<\/strong> and\u00a0type<\/strong> of the following expressions? Work these out on paper and then test your answers by typing them into the Code Pad in BlueJ. Can you explain the result?<\/p>\n

      \n
    1. 5 \/ 2<\/li>\n
    2. 5 % 2<\/li>\n
    3. 5.0 \/ 2<\/li>\n
    4. 5 \/ 2.0<\/li>\n
    5. 5.0 \/ 2.5<\/li>\n
    6. 5.0f \/ 2<\/li>\n
    7. 1.5 % 1<\/li>\n
    8. 1 \/ 0<\/li>\n
    9. 1.0 \/ 0<\/li>\n
    10. 10000000000 + 1<\/li>\n
    11. 10000000000L + 1<\/li>\n
    12. 10000000000.0 + 1<\/li>\n
    13. 10000000000.0f + 1<\/li>\n
    14. int x = 10;<\/li>\n
    15. x = x + 2;<\/li>\n
    16. int y = 3;<\/li>\n
    17. int z = x + y + 1;<\/li>\n
    18. x = x+ 2;<\/li>\n<\/ol>\n

      Circle area<\/h3>\n

      The\u00a0circleArea<\/strong> method in the Tut3 class calculates the area of a circle with a given radius.<\/p>\n