fenduan.cpp

来自「用C++实现的多个算法」· C++ 代码 · 共 23 行

#include<iostream.h>
void main(void)
{
	int i,k;
	double x,y;
	double x1[]={0.46,0.47,0.48,0.49},y1[]={0.4846555,0.4937452,
		0.5027498,0.5116683};
	cout<<"请输入X的值：X=";
		cin>>x;
	if(x<x1[0])
		i=1;
	for(k=1;k<=3;k++)
	{
		if(x>x1[k-1]&&x<=x1[k])
			i=k;
	}
	if(x>x1[3])
		i=3;
		y=y1[i]+(y1[i]-y1[i-1])*(x-x1[i])/(x1[i]-x1[i-1]);
		
		cout<<"Y的近似值:Y="<<y<<endl;
}