c# Version
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApp1
{
class Program
{
static void Main(string[] args)
{
/*----------------------------------------------------------*/
Console.WriteLine("Decimal2");
/*----------------------------------------------------------*/
double a = 6.283;
Console.WriteLine("Before Round: " + a);
Console.WriteLine("After Rounding: " + Math.Round(a, 2));
a = 6.283;
Console.WriteLine("Before Floor: " + a);
Console.WriteLine("After Floor: " + Math.Floor(a));
a = 6.283;
Console.WriteLine("Before Ceiling: " + a);
Console.WriteLine("After Ceiling: " + Math.Ceiling(a));
/*----------------------------------------------------------*/
Console.WriteLine("Decimal1");
/*----------------------------------------------------------*/
a = 6.283;
Console.WriteLine("Before Round: " + a);
Console.WriteLine("After Rounding: " + Math.Round(a, 1));
a = 6.283;
Console.WriteLine("Before Floor: " + a);
Console.WriteLine("After Floor: " + Math.Floor(a));
a = 6.283;
Console.WriteLine("Before Ceiling: " + a);
Console.WriteLine("After Ceiling: " + Math.Ceiling(a));
/*----------------------------------------------------------*/
Console.WriteLine("Decimal0");
/*----------------------------------------------------------*/
a = 6.283;
Console.WriteLine("Before Round: " + a);
Console.WriteLine("After Rounding: " + Math.Round(a));
a = 6.283;
Console.WriteLine("Before Floor: " + a);
Console.WriteLine("After Floor: " + Math.Floor(a));
a = 6.283;
Console.WriteLine("Before Ceiling: " + a);
Console.WriteLine("After Ceiling: " + Math.Ceiling(a));
Console.ReadLine();
}
}
}
c++ Version
#include <iostream>
#include <string>
//using namespace std;
int main (int argc, const char * argv[])
{
// Normales runden
std::cout << "Runden" << std::endl;
std::cout << "round(+2.3) = " << std::round(2.3) // abgerundet
<< " round(+2.5) = " << std::round(2.5) // aufgerundet
<< " round(+2.7) = " << std::round(2.7) << '\n' // aufgerundet
<< "round(-2.3) = " << std::round(-2.3) // abgerundet (-2)
<< " round(-2.5) = " << std::round(-2.5) // aufgerundet (-3)
<< " round(-2.7) = " << std::round(-2.7) << '\n'; // aufgerundet (-3)
std::cout << "round(-0.0) = " << std::round(-0.0) << '\n' // 0
<< "round(-Inf) = " << std::round(-INFINITY) << '\n'; // -infinity
/*------------------------------------------------------------------------------------------------------------*/
std::cout << "#####################################################" << std::endl;
/*------------------------------------------------------------------------------------------------------------*/
// lround
std::cout << "lRunden" << std::endl;
std::cout << "lround(+2.3) = " << std::lround(2.3) // abgerundet
<< " lround(+2.5) = " << std::lround(2.5) // aufgerundet
<< " lround(+2.7) = " << std::lround(2.7) << '\n' // aufgerundet
<< "lround(-2.3) = " << std::lround(-2.3) // abgerundet (-2)
<< " lround(-2.5) = " << std::lround(-2.5) // aufgerundet (-3)
<< " lround(-2.7) = " << std::lround(-2.7) << '\n'; // aufgerundet (-3)
std::cout << "lround(-0.0) = " << std::lround(-0.0) << '\n' // 0
<< "lround(-Inf) = " << std::lround(-INFINITY) << '\n'; // 0
/*------------------------------------------------------------------------------------------------------------*/
std::cout << "#####################################################" << std::endl;
/*------------------------------------------------------------------------------------------------------------*/
// floor runden
std::cout << "Floor Runden" << std::endl;
std::cout << std::fixed
<< "floor(+2.7) = " << std::floor(+2.7) << '\n' // abgerundet (2)
<< "floor(-2.7) = " << std::floor(-2.7) << '\n' // aufgerundet ( also abgerundet) (-3)
<< "floor(-0.0) = " << std::floor(-0.0) << '\n' // bleibt 0
<< "floor(-Inf) = " << std::floor(-INFINITY) << '\n'; // -inf
/*------------------------------------------------------------------------------------------------------------*/
std::cout << "#####################################################" << std::endl;
/*------------------------------------------------------------------------------------------------------------*/
// ceiling runden
std::cout << "Ceiling Runden" << std::endl;
std::cout << std::fixed
<< "ceil(+2.4) = " << std::ceil(+2.4) << '\n' // aufgerundet (3)
<< "ceil(-2.4) = " << std::ceil(-2.4) << '\n' // abgerundet ( also aufgerundet) (-2)
<< "ceil(-0.0) = " << std::ceil(-0.0) << '\n' // bleibt 0
<< "ceil(-Inf) = " << std::ceil(-INFINITY) << '\n'; // -inf
/*------------------------------------------------------------------------------------------------------------*/
double Zahl = 5.4562;
double Stellen = 2;
Zahl *= pow( 10, Stellen);
if (Zahl >= 0)
Zahl = floor(Zahl + 0.5);
else
Zahl = ceil(Zahl - 0.5);
Zahl *= pow(10, -Stellen);
std::cout << Zahl << std::endl;
return Zahl;
}