### Input & Output problem

 ``1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950`` ``````#include #include using namespace std; const int SENTINEL = 'Q'; //type to stop the loop int main() { float A, G, V; float length, width, depth; char number; cout << setiosflags(ios::showpoint) << setiosflags(ios::fixed) << setprecision(2); cout << "Enter numbers for Surface Area(A), Girth(G), and Volume(V). To stop the loop, enter Q." << endl; cin >> number; while(number != SENTINEL) //sentinel controlled while loop { float length, width, depth; switch (number) { case 'A': A = 2*length*width + 2*width*depth + 2*length*width; cout << "The surface area is " << A << endl; break; case 'G': G = 2*length*width + depth; cout << "The girth+depth is " << G << endl; break; case 'V': V = length*width*depth; cout << "The volume is " << V << endl; break; } cin >> number; } system("pause"); return 0; }``````

At the moment, that is my program I created. I'm supposed to find the surface area, girth, and volume using the formulas given:
Volume = LWD (length X width X Depth)
Surface Area = 2LW plus 2WD plus 2LD
Girth = 2(L plus W) plus D

*input of the program will be a letter. (example: "V" will indicate volume, "A" for surface area, and "G" for girth) & Q is the sentinel (to stop loop).
*Second part of the input will be a three (float) numbers representing length, width, and depth respectively.
For example: A 2.0 3.0 4.0 means "Find the surface area of box with length = 2.0, width = 3.0, and depth = 4.0.

I'm using a switch structure to control the actions.
And the inputs are:
A 1.0 2.0 3.0
G 5.0 4.0 3.0
V 2.3 4.9 6.7
A 3.7 4.3 9.6
Q

 ```Enter numbers for Surface Area(A), Girth(G), and Volume(V). To stop the loop, en ter Q. A 1.0 2.0 3.0 The surface area is 0.00 G 5.0 4.0 3.0 The girth+depth is 0.00 V 2.3 4.9 6.7 The volume is 0.00 A 3.7 4.3 9.6 The surface area is 0.00 Q Press any key to continue . . .```

^^ that is my output. So the problem is for me is that it comes out as "0.00" for all outputs.
Is there anyway to fix that?
Use char variable for a,v,g,q. After you get input for the char variable , you didn't ask the user to input for length,width,depth . So put cin statements for above after while condition
Okay, so i changed the variable for a,v,g from "float" to "char".
 ``123`` ``````char A, G, V; float length, width, depth; char number;``````

and i put the cin statement "cin >> length, width, depth;" above while condition
 ``123456`` ``````cout << "Enter numbers for Surface Area(A), Girth(G), and Volume(V). To stop the loop, enter Q." << endl; cin >> number; cin >> length, width, depth; while(number != SENTINEL) //sentinel controlled while loop {``````

but my output is this:
 ```Enter numbers for Surface Area(A), Girth(G), and Volume(V). To stop the loop, en ter Q. A 1.0 2.0 3.0 The surface area is G 5.0 4.0 3.0 The girth+depth is Q Press any key to continue . . .```

Giving me a blank answer. Not sure if i put the cin statement right.
Last edited on
Hmmm - perhaps number is not a good name for a variable that is a char !!

Variables A, V, G should be float or double because that's what holds the answer to you calculations

Here is a better way to quit from something:

 ``123456789`` ``````bool Quit = false; while (!Quit) { //your code here //user wants to quit Quit = true; } ``````

Use the toupper function, so you don't have to test the input twice.
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