Exercise 4.38

ch.04/worldPopulationGrowth.cpp

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+// Deitel ch.04 exercise 4.38
+// accoring to "www.worldometers.info" the current
+// world population is %1.05
+#include <iostream>
+#include <iomanip>
+
+using namespace std;
+
+int main(){
+    // declaring current year
+    float currentYear{2020};
+    // declaring the growth rate
+    float rate{1.05};
+
+    // setting floating point precision
+    cout << setprecision(3)<<fixed;
+
+// printing out the next 10 years to keep it small
+    // using a counter-controlled while loop
+    int count{10};
+    while(count > 0){
+        cout << static_cast<int>(currentYear) << "\t";
+        currentYear++;
+        count--;
+    }
+    cout << endl;
+
+// printing out the anticipated population
+    // declaring the current population
+    float currentPop{81};
+    // declaring the anticipated population
+    float popResult;
+
+    // using counter controlled while loop to claculate
+    count = 10;
+    while (count > 0){
+        // calculating the percentage
+        popResult = currentPop + ((currentPop * rate)/100);
+        cout << popResult << "\t";
+        currentPop = popResult;
+        count--;
+    }
+    cout << endl;
+}