{"id":507,"date":"2013-08-08T21:54:00","date_gmt":"2013-08-09T04:54:00","guid":{"rendered":"http:\/\/blogs.unsw.edu.au\/comp1400\/?p=507"},"modified":"2013-08-13T23:47:18","modified_gmt":"2013-08-14T06:47:18","slug":"lab-week-3-data-types","status":"publish","type":"post","link":"https:\/\/blogs.unsw.edu.au\/comp1400\/blog\/2013\/08\/lab-week-3-data-types\/","title":{"rendered":"Lab Week 3 – Data Types"},"content":{"rendered":"

This week’s lab exercises are concerned with data types, which were introduced in last week’s lectures.<\/p>\n

Feedback on your progress<\/h3>\n

At the start of the lab, you’ll be given a short quiz on writing simple methods. This shouldn’t take more than 15 minutes.<\/p>\n

Each week, we will ask you 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’ll be given a mark for each quiz just to make sure that you take them seriously, but\u00a0note that they contribute only a small part to your final assessment (about half of your lab mark, the other half from your attempts at the lab exercises).\u00a0Your answers will be marked as either satisfactory or unsatisfactory by your tutor during the lab. If you have a good reason for missing a quiz, talk to your tutor about making it up.<\/p>\n

After completing the quiz, 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