Messing with Geometry in C++.

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**Purpose**

To use symbolic constants, nested decisions, and sentinel loops.

Write a simple C++ program to calculate the surface area, volume, or cross-sectional are of a sphere. Use functions to calculate each figure. The formulas are as follows for the stupid sphere:

`Volume = 4.0/3.0*Pi*r^3 (^ means to the power of in case you didn't know but I know probably you know...smart ass) Surface Area = 4.0*Pi*r^2 Cross-Sectional Area = Pi*r^2`

- The input of this friggin program will be a damn letter. โVโ as in V for Vendetta will indicate volume, โAโ will indicate surface area, โXโ as in drop that x before she cheats will indicate the cross-sectional area, and finally โQโ will indicate you want to quit this little midget of a program.The second part of this dang long input will be a single float number representing the rocking radius. Woo.
- Now to provide a detestable little example: A 12.8 means find the surface area of a sphere with radius 12.8. Ergo, V 15.7 means find the volume of a sphere with radius 15.7. Get it, got it, goo.. and no one gives a shiz!
- For each input, youโre suppose to just calculate what is called for (like volume, surface area, cross-section) not all three dang answers. The coding doesnโt do that crazy shiz here. Just use NESTED decisions to control your actions. NESTED as in nest as in bird as in bird procreation. Fantastic! Now, the output should have appropriate labels and donโt forgot to use formatting to control the appearance of your answers, no one likes coding that could make a dang on blind kid cry his eyes out.
- Use sentinel controlled while loops to read the data. The letter โQโ will be the sentinel. The program should work for any data set, not just my data set. So get your numbers right the first dang time! If the first input to the program is โQโ, the loop should be inactive (I mean - duh dipshiz).
- FINALLY, use 3.14159 for ฯ, that lovely global symbolic constant. Fun fact, half of ฯ is 1.618, the GOLDEN RATIO! WOAHHHHHH.

**Libraries**

iostream, cmath, iomanip

**Solution**\ [code language=โcโ]\ #include iostream\ #include cmath\ #include iomanip\ using namespace std;\ const char QUIT = โQโ;\ const float PI = 3.1415927;\ int main()\ {\ float radius, surface_area, volume, cross_section;\ char method;\ cout << โPlease enter\nโ\ << โV for volume,\nโ\ << โA for surface areaโ\ << โ,X for cross-sectional area,\nโ\ << โand finally Q if you would like to quit.\nโ;\ cin >> method;

while(method != QUIT)\ {\ cout << โNow please enter the radius of your sphere.\nโ;\ cin >> radius;\ if(method == โVโ)\ {\ volume = 4.0/3.0 * PI * radius * radius * radius;\ cout << โThe volume of the sphere is:โ <<volume<> method;\ }\ system(โpauseโ);\ return 0;\ }\ [/code]

**Sample Input (AKA MY NUMBERS HARPY)**

```
A 15.9
X 12.8
V 34.8
A 23.8
Q (The sentinel)
```

**Output**

Just look at the friggin file right up in here that I provided your a**.

[scribd id=156212922 key=key-p1nebd1shusya4d1sdo mode=scroll]

2nd post - hollla!

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