CS156 HW3: Conversion

Description

For this assignment, you will write a program called rt.c that does two wildly unconnected things: show the most popular religions and convert temperatures from Fahrenheit to Celsius. (Some religions have hot & cold places—perhaps that connects the two.)

Fahrenheit to Celsius

°C × 9/5 + 32 = °F
Of course, you want to go the other way.

Religions by popularity

Here are the ten most popular religions in the world, according to Wikipedia:

index	Religion	Popularity
1	Christianity	31.2%
2	Islam	24.1%
3	Secular/Nonreligious/Agnostic/Atheist	16%
4	Hinduism	15.1%
5	Buddhism	6.9%
6	Chinese traditional religion	5.50%
7	Ethnic religions	4.19%
8	African traditional religions	1.40%
9	Sikhism	0.32%
10	Spiritism	0.21%

Sample Run

“%” is the prompt and not a part of your program. Your input looks like this. Your output should match exactly.

    % c11 -Wall rt.c
    % ./a.out
    q: quit
    h: help
    r: info about a religion
    t: temperature conversion
    Command: t
    Fahrenheit: 212
    212.000000 Fahrenheit is 100.000000 Celsius
    Command: t
    Fahrenheit: 68.5
    68.500000 Fahrenheit is 20.277778 Celsius
    Command: z
    Invalid command
    Command: h
    q: quit
    h: help
    r: info about a religion
    t: temperature conversion
    Command: r
    Which religion? 5
    Buddhism: 6.9%
    Command: r
    Which religion? 3
    Secular/Nonreligious/Agnostic/Atheist: 16%
    Command: r
    Which religion? 100
    Don't know anything about religion #100.
    Command: r
    Which religion? 6
    Chinese traditional religion: 5.50%
    Command: t
    Fahrenheit: 65.5
    65.500000 Fahrenheit is 18.611111 Celsius
    Command: q

Required Functions

You must define and use the following functions:

void print_menu();: Display the help menu, as shown above.
void religion(int);: Display the information about that particular religion. For example, religion(5) would display information about Buddhism. If the number is out of range, display as shown in the sample run.
double celsius(double);: Return the Celsius equivalent of a Fahrenheit temperature.

Note the difference between displaying something and returning something. celsius must not call printf. None of the required functions should call scanf.

Debugging

If you encounter “STACK FRAME LINK OVERFLOW”, then try this:

    export STACK_FRAME_LINK_OVERRIDE=ffff-ad921d60486366258809553a3db49a4a

Requirements

Use the list of religions and exact values shown above. Do not research better values, or find more religions.
You may assume the user will enter the proper type of value, when prompted, but you might not like the value.
All output should be exactly like the output described in the sample run. Pretend that you’re doing this for a client, so you do what the client tells you to do. Don’t change the text for the prompt, or have the prompt in a different spot than the way the client specifies. You are working for the client, so do what the client asks!
Comments:
- Every function must have a comment before it, describing what the function does.
- a comment header containing your name, date, and purpose of your program at the very very very top;
No global variables.
For readability, don’t use ASCII int constants (65) instead of char constants ('A') for printable characters.

How to submit your homework:

Use web checkin, or:

    ~cs156/bin/checkin HW3 rt.c

Follow the directions on the homework page.

How to receive negative points:

Turn in someone else’s work.

CS156: Intro to C, Part I

Spring 2018

HW 3