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  1. //Castulo Jason Quintero            CSC5          Chapter 6, Pg. 374, #16
  2. //
  3. /**************************************************************************
  4.  *
  5.  * Calculate Transient Population Size
  6.  * ________________________________________________________________________
  7.  * This program recieves as user input the current population
  8.  * size, annual birth rate, annual death rate, and years
  9.  * requested to display , population that leaves and enters
  10.  * the region to calculate the new population size each year.
  11.  *
  12.  * Computation is based on formula:
  13.  *  newPopulationsize = previousPopulationsize +
  14.  *  					(birthRate * previousPopulationsize) -
  15.  *  					(deathRate * previousPopulationsize) +
  16.  *  					(PopEnter - popLeave)
  17.  * ________________________________________________________________________
  18.  * INPUT
  19.  *  previousPopulationsize    : Previous population size
  20.  *	birthRate                 : Annual birth rate percentage
  21.  *	deathRate                 : Annual death rate percentage
  22.  *	year                      : Years requesting to be displayed
  23.  *	popEnter                  : Population that enters each year
  24.  *	popLeave                  : Population that leaves each year
  25.  *
  26.  * OUTPUT
  27.  *  year                      : Year being displayed with loop
  28.  *  newPopulationsize         : New size of population each year
  29.  *************************************************************************/
  30.  
  31. #include <iostream>
  32. #include <iomanip>
  33. using namespace std;
  34.  
  35. // Prototype
  36. float popSize(float, float, float, float, float);
  37.  
  38. // Main function
  39. int main()
  40. {
  41. 	float newPopulationsize;            // New population size
  42. 	float previousPopulationsize = 0;   // Previous population size
  43. 	float birthRate;                    // Annual birth rate percentage
  44. 	float deathRate;                    // Annual death rate percentage
  45. 	float year;                         // Years requesting to be displayed
  46. 	float popLeave;
  47. 	float popEnter;
  48.  
  49.     // Input for starting population
  50.     cout << "Please enter the starting size of the population: \n";
  51.     cin >> previousPopulationsize;
  52.  
  53.     // Input validation
  54.     while (previousPopulationsize < 2)
  55.     {
  56.     	cout << "Please enter a starting population that is atleast "
  57.     		 << "two people. \n";
  58.     	cin >> previousPopulationsize;
  59.     }
  60.  
  61.     // Input annual birth rate percentage
  62.     cout << "Please enter the annual birth rate percentage: \n";
  63.     cin >> birthRate;
  64.  
  65.     // Input validation
  66.     while (birthRate < 0)
  67.     {
  68.     	cout << "Please enter a non negative number for the birth rate \n";
  69.     	cin >> birthRate;
  70.     }
  71.  
  72.     // Input annual death rate percentage
  73.     cout << "Please enter the annual death rate percentage: \n";
  74.     cin >> deathRate;
  75.  
  76.     // Input validation
  77.     while (deathRate < 0)
  78.     {
  79.     	cout << "Please enter a non negative number for the birth rate \n";
  80.     	cin >> deathRate;
  81.     }
  82.  
  83.     // Input years to be displayed
  84.     cout << "Please enter the number of years to be displayed: \n";
  85.     cin >> year;
  86.  
  87.     // Input validation
  88.     while (year < 1)
  89.     {
  90.     	cout << "Please enter a value greater than 1 for the years to "
  91.     		 << "be displayed. \n";
  92.     	cin >> year;
  93.     }
  94.  
  95.     // Input population that leaves each year
  96.     cout << "Please enter the amount of people who leave each year: \n";
  97.     cin >> popLeave;
  98.  
  99.     // Input validation
  100.     while (popLeave < 0)
  101.     {
  102.     	cout << "Please enter a value that is not less than 0: \n";
  103.     	cin >> popLeave;
  104.     }
  105.  
  106.     // Input population that enter each year
  107.     cout << "Please enter the amount of people who enter each year: \n";
  108.     cin >> popEnter;
  109.  
  110.     // Input validation
  111.     while (popEnter < 0)
  112.     {
  113.      	cout << "Please enter a value that is not less than 0: \n";
  114.         cin >> popEnter;
  115.     }
  116.  
  117.     // For loop to give value for each year
  118. 	for (int i = 1; i <= year; i++)
  119. 	{
  120. 		newPopulationsize = popSize(previousPopulationsize, birthRate,
  121.     			                    deathRate, popLeave, popEnter);
  122.     	previousPopulationsize = newPopulationsize;
  123.  
  124.     	cout << setprecision(0) << fixed;
  125.     	cout << "The population for year " << i << " was "
  126.     	    << newPopulationsize << endl;
  127. 	}
  128. 	return 0;
  129. }
  130.  
  131. // Value return function and calculations
  132. float popSize (float P, float B, float D, float E, float L)
  133. {
  134. 	float N;
  135. 	B *= .01;                             // Converts to percentage
  136. 	D *= .01;                             // Converts to percentage
  137. 	N = (P + (B * P) - (D * P)) + E - L;  // Formual to get new population
  138. 	return N;                             // Return value of N
  139. }
Success #stdin #stdout 0s 5304KB
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stdin
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100 10 5 5 2 5
stdout
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Please enter the starting size of the population: 
Please enter the annual birth rate percentage: 
Please enter the annual death rate percentage: 
Please enter the number of years to be displayed: 
Please enter the amount of people who leave each year: 
Please enter the amount of people who enter each year: 
The population for year 1 was 102
The population for year 2 was 104
The population for year 3 was 106
The population for year 4 was 109
The population for year 5 was 111
https://ideone.com/UKAxjd
language:
C++ (gcc 8.3)
created:
1 year ago
visibility:
secret

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