Методы вычислений 1

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication2
{
class Program
{

static double MyFunc(double x)
{
return x * Math.Cos(x);
}
//x*Math.Cos(x)

static double FuncPlus(double next, double current, double h)
{
return next - current / h;
}

static double FuncMinus(double previous, double current, double h)
{
return current - previous / h;
}

static double FuncMiddle(double next, double previous, double h)
{
return next - previous / 2 * h;
}

static void Main(string[] args)
{
double e = 0.0001, a = 0.0, b = 1.7, x = 0, h = 0.1, sum = 0;
for (x = a; x <= b; x += h)
{
double current = x;
double next = 1;
double previous = 1;
double Plus = 0, Minus = 0, Middle = 0, Func = 0;
int k = 0;
while (Math.Abs(current) >= e)
{
sum += current;
previous = current;
Minus = FuncMinus(previous, current, h);
next = current * (-((x * x) / (2 * (k + 1) * (2 * k + 1))));
Plus = FuncPlus(next, current, h);
current = next;

Middle = FuncMiddle(next, previous, h);
Func = MyFunc(x);
k++;
}
Console.WriteLine("x: {0} \t sum: {1} \t f(x): {2} \t f_+(x): {3} \t f_-(x): {4} \t f_0(x): {5}", x, sum, Func, Plus, Minus, Middle);
sum = 0;
}
Console.Read();
}
}
}