数值分析——c++实现非线性方程求根的方法

今天做数值分析实验，实验内容是C++实现几个非线性求根的小程序（二分法、迭代法、迭代过程的加速）
代码如下

#include <iostream>
#include<cmath>
using namespace std;
float binSearch();

float diedai();

float speed();
int main(void)
{
    int o = 666;
    while (o != 0)
    {
        cout << "-------非线性方程求根-------" << endl;
        cout << "1：二分法" << endl;
        cout << "2：迭代法" << endl;
        cout << "3.迭代过程的加速" << endl;
        cout << "0：退出" << endl;
        cout << "请选择功能：";
        cin >> o;
        switch (o)
        {
        case 1:
            cout << "所求根：" << binSearch() << endl;
            break;
        case 2:
            cout << "所求根：" << diedai() << endl;
            break;
        case 3:
            cout << "所求根" << speed() << endl;
        default:
            break;
        }
        system("pause");
        system("cls");
    }
    return 0;
}

float binSearch()
{
    float x;
    cout << "要查找的数：";
    cin >> x;
    int a[100],
    int low, high, mid;
    low = 0;
    high = n - 1;
    while (low <= high)
    {
        mid = (low + high) / 2;
        if (x < a[mid])
            high = mid - 1;
        else if (x > a[mid])
            low = mid + 1;
        else
            return mid;
    }
    return -1;
}

float diedai()
{
    return -1;
}

float speed()
{
    return -1;
}

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