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  1. //Cecilia Rangel	 CSC5	 Chapter 6,				 P.373, #15
  2. //
  3. /**************************************************************
  4.  *
  5.  * CALCULATE POPULATION SIZE
  6.  * ____________________________________________________________
  7.  * This program will ask for the user to input a positive
  8.  * number, and the program determines if the number is a prime 
  9.  * number
  10.  * 
  11.  *_____________________________________________________________
  12.  * INPUT
  13.  *  	population   : size of population
  14.  *		years        : Number of years to display.
  15.  *		Birth        : Annual birth rate.
  16.  *		Death        : Annual death rate.
  17.  * OUTPUT
  18.  *		new		     : New population size.
  19.  *									
  20.  *
  21.  **************************************************************/
  22. #include <iostream>
  23. #include <iomanip>
  24. using namespace std;
  25.  
  26. int calculatePopulation(int popSize, int birthRate, int deathRate);
  27.  
  28. int main() {
  29. 	int popSize;
  30. 	int birthRate;
  31. 	int deathRate;
  32. 	int years;
  33. 	int newPop;
  34.  
  35. 	cout << "What is the starting size of a population? ";
  36. 	cin >> popSize;
  37. 	if (popSize < 2) {
  38. 		cout << "Please choose a bigger number for the starting size.";
  39. 	}
  40. 	cout << "What is the annual birth rate? ";
  41. 	cin >> birthRate;
  42. 	if (birthRate < 0) {
  43. 		cout << "Please do not choose negative integers.";
  44. 	}
  45. 	cout << "What is the annual death rate? ";
  46. 	cin >> deathRate;
  47. 	if (deathRate < 0) {
  48. 		cout << "Please do not choose negative integers.";
  49. 	}
  50. 	cout << "What year is it? ";
  51. 	cin >> years;
  52. 	if (years < 1) {
  53. 		cout << "Please do not go lower than 1.";
  54. 	}
  55.  
  56. 	newPop = calculatePopulation(popSize, birthRate, deathRate);
  57.  
  58. 	cout << "This is the new population size " << newPop << " new humans in this world in the year " << years;
  59.  
  60.  
  61.  
  62. 	return 0;
  63. }
  64.  
  65. //Calculating the new world population with taking the inputs from main
  66.  
  67. int calculatePopulation(int popSize, int birthRate, int deathRate) {
  68. 	return (popSize + (birthRate * popSize) - (deathRate * popSize));
  69. }
  70.  
Success #stdin #stdout 0s 5320KB
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10
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2411
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What is the starting size of a population? What is the annual birth rate? What is the annual death rate? What year is it? This is the new population size 0 new humans in this world in the year 2411
https://ideone.com/XUKgrn
language:
C++ (gcc 8.3)
created:
1 hour ago
visibility:
public

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