C++ Simple Recursive Program Help - C And C++ | Dream.In.Code

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6 Replies - 61 Views - Last Post: Yesterday, 06:12 PM Rate Topic:

#1 youboughtanngage ?

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• Posts: 4
• Joined: Yesterday, 03:00 PM

Posted Yesterday, 03:04 PM

 double growth(int timeSteps, double r, double X) {  	if(timeSteps >= 0) 	{ 		if (X < 0) 		{ 			X = 0; 		} 		else if (X > 1) 		{ 			X = 1; 		}                  cout << timeSteps << " " << X << endl; 		X = r*X*(1-X); 		timeSteps = timeSteps - 1;                 growth(timeSteps, r, X);          		if (timeSteps==0)         {            return X;         }     } }   int main() {     cout << "Specify model parameters (Time limit, Growth, Initial Population): ";     double X, r;     int timeSteps;     cin >> timeSteps >> r >> X;     cout << "Time " << "Population" << endl;     double k=growth(timeSteps, r, X);     cout << "The final population was: " << k;  	return 0; } 

Simple program for growth decay. Works fine except for getting the desired output for final population (which is already displayed).

Displays:

Specify model parameters (Time limit, Growth, Initial Population): 5 1 0.5
Time Population
5 0.5
4 0.25
3 0.1875
2 0.152344
1 0.129135
0 0.112459
The final population was: 6.95322e-310

Final population should be 0.112459, the 0 time value. I've tried a few things to get around this but am stuck. Any ideas?

Is This A Good Question/Topic? 0

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Replies To: C++ Simple Recursive program help

#2 tlhIn`toq ?

Reputation: 4838

• Posts: 10,225
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Re: C++ Simple Recursive program help

Posted Yesterday, 03:14 PM

Line 14 you display this final output: 0 0.112459
Line 15-16 Then you continue to do math on the X and timeSteps you just displayed.
Line 22 Then you return your newly computed values that were never displayed.

Do the math, then display the results.

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#3 youboughtanngage ?

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• Posts: 4
• Joined: Yesterday, 03:00 PM

Re: C++ Simple Recursive program help

Posted Yesterday, 03:19 PM

Sorry is there any way you could be more clear?
I really only want to return the final time=0 value for the final population. If I did the math first, how would I display the initial population?

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#4 tlhIn`toq ?

Reputation: 4838

• Posts: 10,225
• Joined: 02-June 10

Re: C++ Simple Recursive program help

Posted Yesterday, 03:23 PM

Let me try it another way...
How can you return the value you display on line 14, if your very next step is to change that value on line 15?

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#5 youboughtanngage ?

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Re: C++ Simple Recursive program help

Posted Yesterday, 03:34 PM

I get what you're saying, but I'm still at a loss for how to get this program to work while keeping it recursive (assignment).

I've tried incorporating while loops, which expectedly destroy the output format (correct values but many repeat), but show final population correctly.
The program works properly, I just don't know how to stop it when time=0.

Sorry, if I'm blatantly messing something, stumped here.

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#6 CTphpnwb ?

Reputation: 2458

• Posts: 8,415
• Joined: 08-August 08

Re: C++ Simple Recursive program help

Posted Yesterday, 06:00 PM

Let's start from a different angle.

• On line 18 the function calls itself. What does it do with the value returned? Answer: nothing! It doesn't even assign it to a variable. Why call itself if nothing is to be done with the result?
  
• One line 24 an if{} ends and the so the function can return without returning a value, but it is defined to return a double. See a problem?

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#7 youboughtanngage ?

Reputation: 0

• Posts: 4
• Joined: Yesterday, 03:00 PM

Re: C++ Simple Recursive program help

Posted Yesterday, 06:12 PM

Finally got it! Thanks for the help!

Aaaaand still have 49 minutes till it's due this calls for /> !

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