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  1. //Eric Bernal                 CS1A                        Chapter 6, P. 373, #15
  2. //
  3. /*******************************************************************************
  4.  * CALCULATE POPULATION SHIFT
  5.  * _____________________________________________________________________________
  6.  * This program calculates the shift in a population based off of a given number
  7.  * of years, annual birth rate, and the annual death rate.
  8.  * _____________________________________________________________________________
  9.  * Input
  10.  * popBefore   : The population before the shift.
  11.  * birthRate   : The annual birth rate as a percentage.
  12.  * deathRate   : The annual death rate as a percentage.
  13.  * years       : The number of years that has passed.
  14.  * 
  15.  * Output
  16.  * popAfter    : The population after the shift.
  17.  ******************************************************************************/
  18.  
  19. #include <iostream>
  20. using namespace std;
  21.  
  22. // Function Prototype
  23. float popShift(int before, float birthRate, float deathRate);
  24.  
  25. int main() {
  26. 	// Data Dictionary - Initialize all Variables
  27. 	float popBefore;      //INPUT : The population total before
  28. 	float birthRate;      //INPUT : The annual birth rate as a percentage.
  29. 	float deathRate;      //INPUT : The annual death rate as a percentage.
  30. 	float years;          //INPUT : The number of years of change
  31. 	float popAfter;       //OUTPUT: The population total after.
  32.  
  33. // Obtain all values prompt
  34.     cout << "Please enter the following: \nPopulation: \nBirth Rate: \nDeath Rate: "
  35.      << "\n Years: \nPlease enter the values a positive whole numbers." << endl;
  36.      cin >> popBefore >> birthRate >> deathRate >> years;
  37.  
  38.     //INPUT VALIDATION
  39.     if (popBefore < 1) 
  40.     { 
  41.     	cout << "Please enter a population greater than 0: " << endl;
  42.     	cin >> popBefore;
  43.     }
  44.  
  45.     if (birthRate <= 0)
  46.     {
  47.     	cout << "Please enter a whole number greater than 0." << endl;
  48.     	cin >> birthRate;
  49.     }
  50.  
  51.     if (deathRate <= 0)
  52.     {
  53.     	cout << "Please enter a whole number greater than 0." << endl;
  54.     	cin >> deathRate;
  55.     }
  56.  
  57.     if (years < 1)
  58.     {
  59.     	cout << "Please enter a whole number greater than 0." << endl;
  60.     	cin >> years;
  61.     }
  62.  
  63. 	// Create Population Table Chart
  64. 	popAfter = popBefore;
  65. 	cout << "Year 0: " << popAfter << endl;
  66.  
  67. 	// For loop to count the years
  68. 	for (int i = 1; i <= years; i++)
  69. 	{
  70. 		popAfter = popShift(popAfter, birthRate, deathRate); //Function Call
  71. 		cout << "Year " << i << ": " << popAfter << endl;
  72. 	}
  73. 	return 0;
  74. }
  75.  
  76. /******************************************************************************
  77.  * The purpose of the following function is to calculate the population shift.
  78.  ******************************************************************************/
  79.  float popShift(int before, float birthRate, float deathRate)
  80.  {
  81.  	return before * (1 + (birthRate/100) - (deathRate/100));
  82.  }
Success #stdin #stdout 0.01s 5280KB
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stdin
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1000
5
10
10
stdout
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Please enter the following: 
Population: 
Birth Rate: 
Death Rate: 
 Years: 
Please enter the values a positive whole numbers.
Year 0: 1000
Year 1: 950
Year 2: 901.55
Year 3: 855.95
Year 4: 812.25
Year 5: 771.4
Year 6: 732.45
Year 7: 695.4
Year 8: 660.25
Year 9: 627
Year 10: 594.7
https://ideone.com/TueONI
Chapter 6, P. 373, #15
language:
C++ (gcc 8.3)
created:
1 year ago
visibility:
secret

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