时间:2021-03-12 09:54:56 | 栏目:C代码 | 点击:次
本文实例为大家分享了C++实现二分法求连续一元函数根的具体代码,供大家参考,具体内容如下
设计一个用二分法求连续一元函数根的通用函数solve
此函数有三个参数:
函数的返回值为求得的解
要求编写main函数如下:
double fun(double x) { double y; y=4*pow(x,3)-6*pow(x,2)+3*x-2; return y; } int main() { cout<<"4*x^3-6*x^2+3*x-2=0在区间(1,2)的根为 x="<<solve(fun,1,2); return 0; }
C++实现:
#include <iostream> #include <cmath> using namespace std; double solve(double (*fun)(double x), double a, double b); double fun(double x); int main() { cout << "4*x^3-6*x^2+3*x-2=0在区间(1,2)的根为 x=" << solve(fun, 1, 2); return 0; } double solve(double (*fun)(double x), double a, double b) { double i = b - a; double c = (a + b) / 2; while (i > 0.0000001) { i = b - a; if (fun(c) == 0)return c; if (fun(c) * fun(a) < 0) { b = c; c = (a + b) / 2; } else { a = c; c = (a + b) / 2; } } return c; } double fun(double x) { double y; y = 4 * pow(x, 3) - 6 * pow(x, 2) + 3 * x - 2; return y; }
总结: