Copyright © 2005 Suradet Jitprapaikulsarn
สงวนลิขสิทธิ์ 2548 สุรเดช จิตประไพกุลศาล

Homework 11 (Due 5 September 2005)

1. Write a function, calcTax, to calculate the tax using the table

For instance, if the income is 3,500,000 then the tax = 500,000 x 12% +  500,000 x 15% + 2,500,000 x 23% = 710,000

            C Solution

           Scheme Solution

2. Write the data definition of date to represent. (วัน เดือน ปี)

     - C definition / data example / code pattern

//--------------------------------------------------------------------------
// Data Definition
// ---------------
//  A date is a structure consisting of
//      - day as number
//      - month as number
//      - year as number
//--------------------------------------------------------------------------
struct Date
{
    int day;
    int month;
    int year;
};

//--------------
// Data Example
//--------------
Date date_1 = {  3, 4, 1900 };
Date date_2 = {  2, 7, 1945 };
Date date_3 = { 12, 4, 1996 };
Date date_4 = {  9, 5, 2000 };

//--------------
// Code Pattern
//--------------
// ... F(Date d)
// {
//     ... d.day ...
//     ... d.month ...
//     ... d.year ...
// }

     - Scheme definition / data example / code pattern

1. Write a function, isLeapyear, to check if a year is a leaps year. A leap year is a year which February has 29 days.

        Hint:

             5 % 2   == 1         and     (remainder 5 2)  = 1

             10 % 7 == 3         and     (remainder 10 7) = 3

             21 % 4 == 1         and     (remainder 21 4) = 1

           C Soluion

          Scheme Solution

2. Write a function, nDay, to calculate the number of days since new year.

          Scheme Solution