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  1. //Andrew Alspaugh                     CS1A          Chapter 6. P. 373. #15
  2.  
  3. /****************************************************************************
  4.  * Calculate Population Increase/Decrease
  5.  * __________________________________________________________________________
  6.  * This Program takes a starting population, a birth and death rate, and a 
  7.  * time period to estimate the size of a population
  8.  * _________________________________________________________________________
  9.  * INPUT: 
  10.  *      population - starting population
  11.  *      birthRate - rate of increase
  12.  *      deathRate - rate of decrease
  13.  *      period - time period of increase/decrease
  14.  * 
  15.  * OUTPUT:
  16.  *      NewPop - new population after calculation
  17.  * ***************************************************************************/
  18.  
  19. #include <iostream>
  20. using namespace std;
  21.  
  22. //prototype
  23. long CalculateNewPop(long population, double birthRate, double deathRate, int period);
  24.  
  25. int main() 
  26. {
  27. //DATA DICTIONARY
  28. 	long population;
  29. 	double birthRate;
  30. 	double deathRate;
  31. 	int period;
  32.  
  33. 	long NewPop;
  34. //INPUT
  35.     //population
  36.     cout << "Enter Population at beginning of time period:" << endl;
  37.     cin >> population;
  38.     while (population <= 2)
  39.     {
  40.     	cout << "Invalid Input: Population must be greater than 2" << endl;
  41.     	cin >> population;
  42.     }
  43.     cout << "Starting Population is " << population << endl;
  44.  
  45.     //birthRate
  46.     cout << "Enter Annual Birth Rate As A Percent:" << endl;
  47.     cin >> birthRate;
  48.     while(birthRate < 0)
  49.     {
  50.     	cout << "Invalid Input: Rate cannot be negative" << endl;
  51.     	cin >> birthRate;
  52.     }
  53.     cout << "Birth Rate is " << birthRate << " percent annual increase" << endl;
  54.  
  55.     //deathRate
  56.     cout << "Enter Annual Death Rate As A Percent:" << endl;
  57.     cin >> deathRate;
  58.      while(deathRate < 0)
  59.     {
  60.     	cout << "Invalid Input: Rate cannot be negative" << endl;
  61.     	cin >> deathRate;
  62.     }
  63.     cout << "Death Rate is " << deathRate << " percent annual decrease" << endl;
  64.  
  65.     //period
  66.     cout << "Enter Time Period for Population" << endl;
  67.     cin >> period;
  68.     while (period <= 0)
  69.     {
  70.     	cout << "Invalid Input: Number of years cannot be less than 1" << endl;
  71.     	cin >> period;
  72.     }
  73.     cout << "The time period for population change calculated will be " << period << endl;
  74.  
  75. //PROCESS
  76.     NewPop = CalculateNewPop(population, birthRate, deathRate, period);
  77.  
  78. //OUTPUT
  79.     cout << "The New Population will be " << NewPop << endl;
  80. 	return 0;
  81. }
  82.  
  83. //CalculateNewPop() Definition
  84. long CalculateNewPop(long population, double birthRate, double deathRate, int period)
  85. {
  86. 	long NewPop = 0;
  87. 	NewPop=population+(population*(birthRate/100 + 1))-(population*(deathRate/100 + 1));
  88. 	return NewPop;
  89. }
  90.  
  91.  
  92.  
Success #stdin #stdout 0.01s 5320KB
comments (?)
stdin
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92309402
167
69
250
stdout
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Enter Population at beginning of time period:
Starting Population is 92309402
Enter Annual Birth Rate As A Percent:
Birth Rate is 167 percent annual increase
Enter Annual Death Rate As A Percent:
Death Rate is 69 percent annual decrease
Enter Time Period for Population
The time period for population change calculated will be 250
The New Population will be 182772615
https://ideone.com/PTku3e
language:
C++ (gcc 8.3)
created:
17 days ago
visibility:
public

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