6.14

/*
6.14 Rounding Numbers
   Deitel & Deitel C++ How to Program, 10th ed (Indian subcontinent adaptation)
   Visual Studio Community 2019
*/
#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;

int roundToInteger(double);
double roundToTenths(double);
double roundToHundredths(double);
double roundToThousandths(double);

int main()
{
   double num;
   cout << "Enter number ( -1 to exit ): ";
   cin >> num;

   while (num != -1)
   {
      cout << setprecision(12);
      cout << num << " rounded to nearest integer: " << roundToInteger(num) << endl;
      cout << num << " rounded to nearest 10th: " << roundToTenths(num) << endl;
      cout << num << " rounded to nearest 100th: " << roundToHundredths(num) << endl;
      cout << num << " rounded to nearest 1000th: " << roundToThousandths(num) << endl;
      cout << endl;
      cout << "Enter number ( -1 to exit ): ";
      cin >> num;
   }
   return 0;
}

int roundToInteger(double num) {
   return floor(num + 0.5);
}

double roundToTenths(double num) {
   return floor(num * 10 + 0.5) / 10;
}

double roundToHundredths(double num) {
   return floor(num * 100 + 0.5) / 100;
}

double roundToThousandths(double num) {
   return floor(num * 1000 + 0.5) / 1000;
}