Introduction to Computer Programming, 2005
Program Assignment Ⅲ
2005/10/14
Scope: Chapter 3 & chapter 4 in Textbook (if, if…else, switch…case and for/while/do…while statement)
Notice:
1. Plagiarism is prohibited.
2. From program assignment 3, TA will randomly choose 10 students to demo program.
Problem: In Taiwan, people have to pay income tax to the government. Now, we use sliding scale tax as their tax formula. They have five scales to levy includes A, B, C, D and E, and the tax rates are 6%, 13%, 21%, 30%, 40%. You job is to design a calculator to calculate the amount of tax payable on a scale according to his/her net income. In sliding scale tax, if your net income is in tax scale C, your payable tax is 370,000 * 6% +(990,000 – 370,000) * 13% +(income – 990,000) * 21% . Please refer to the reference for detail information and explanations.
Deadline: 2005/10/28, 12:00 pm Hand-in:
1. Pack your program (HW3_STUDENTID.c) and document (HW3_STUDENTID.doc (or pdf)) into a compressed file (HW3_STUDENTID.rar (or zip))
2. In the document, you can explain how to achieve this program and use simple flow chart to show your program architecture. Also, you can show what kind of problems you met on developing this program and how to solve them. Notice, use one page to document your program.
3. Send the compressed file to cprog2005@csie.ntu.edu.tw with mail subject [cprog2005]HW3_STUDENTID
4. For example, if your student id is b94902200, the program file name is HW3_b94902200.c, the document file name is HW3_b94902200.doc and compressed file name is HW3_b94902200.rar.
Description:
1. In order to avoid overflow on the value of net income, you have to choose compatible data type.
(Hint. Check the range of int data type. Integer data type may not useful to store net income.) 2. You have to check an incredible income larger than 1,000,000,000.
3. If net income is -1, program is terminated.
4. Use while/do…while/for and break to iteratively ask user to input his/her net income and calculate the payable tax.
5. Use if…else to decide the tax scale (A, B, C, D, E).
6. According to the tax scale, use switch…case to choose the tax rate.
7. Use tax rate and income value to calculate the amount of payable tax.
Example Output:
Please input your net income of this year (-1 to terminate the program): 800000 The tax scale: B.
The tax rate: 13%.
The amount of tax payable on 800000: 78100
Please input your net income of this year (-1 to terminate the program): 100000000 Error: an incredible net income.
Please input your net income of this year (-1 to terminate the program): -1 Program is terminated.
Reference
1. Sliding scale tax
Income (X) Tax Rate Tax Scale Payable Tax
X <=370,000 6% A X * 6%
370,000 < X <= 990,000 13% B 22,200 + (X-370,000) * 13%
990,000 < X <= 1,980,000 21% C 102,800 + (X-990,000) * 21%
1,980,000 < X <= 3,720,000 30% D 310,700 + (X-1,980,000) * 30%
X > 3,720,000 40% E 832,700 + (X-3,720,000) * 40%
If Dr. Milker’s net income is 1,980,000, his tax scale is C and tax rate is 21%.
The payable tax is
370,000 * 6% + (990,000 – 370,000) * 13% + (1,980,000 – 990,000) * 21%
= 102,800 + (1,980,000 – 990,000) * 21%
= 310,700.
If Dr. Milker’s net income is 4,000,000, his tax scale is E and tax rate is 40%.
The payable tax is
370,000 * 6% + (990,000 – 370,000) * 13% + (1,980,000 – 990,000) * 21%
+ (3,720,000 – 1,980,000) * 30%+ (4,000,000 – 3,720,000) * 40%
= 832,700 + (4,000,000 – 3,720,000) * 40%
= 944,700
