关于#c++#的问题：求c++的代码

计算方法有关牛顿迭代和简单迭代法的问题
求c++的代码，提前感谢各位的帮忙，感激不尽

#include<stdio.h>
#include<math.h>
int main( )
{
    float m,n,x1=0.5,t;
    while(1)
    {
        m=2*x1*x1+2*x1+1-pow(2.71,2*x1);
        n=4*x1+2-2*pow(2.71,2*x1);
        t=x1;
        x1=x1-m/n;
        if(fabs(x1-t)<pow(10,-4))
        {
            printf(" %f.",x1);
            break;
        }
    }
    return 0;
} 

#define _USE_MATH_DEFINES //引入自然常数 M_E 
#include<iostream>
#include<cmath>
using namespace std;

double fd(double x)
{
      double fx = 2*x*x+2*x+1-pow(M_E,2*x);
      double dx = 4*x + 2 - 2*pow(M_E,2*x);
      return fx / dx;
}
 
double newton(double x0, double e)
{
    double f = x0;
    double x = x0 - fd(x0);
    while (fabs(x - f) > e)
    {   
        f = x;
        x -= fd(x);
    }
    
    return f; 
}
 
int main()
{
    double x0 = 0.5, e = 1.0e-4;
    cout << newton(x0, e) << endl;
    
    return 0;
}

#include <stdio.h>
#include <stdlib.h>
#include <math.h>


int main()
{
    double x1 = 0, x2;
    double fx1, fx2;
    x2 = 0.5;
    while (fabs(x1 - x2) >= 1e-4)
    {
        x1 = x2;
        fx1 = 2 * x1*x1 + 2 * x1 + 1 - exp(2*x1);  //f(xn)
        fx2 = 4 * x1 - 2-2*exp(2*x1);  //f(xn)'
        x2 = x1 - fx1 / fx2;
    }
    printf("value:%lf", x2);
    system("pause");
    return 0;
}