如何用分段线性插值求某个函数值?

来源：百度知道 编辑：UC知道 时间：2024/05/28 03:31:23
已知:
x=0.0,0.1,0.195,0.3,0.401,0.5时,
f(x)分别=0.39894,0.39695,0.39142,0.38138,0.36812,0.35206
怎么编一个C++程序,求得结果.

#include <iostream.h>

void main()
{
double x[6] = {0.0, 0.1, 0.195, 0.3, 0.401, 0.5};
double f[6] = {0.39894,0.39695,0.39142,0.38138,0.36812,0.35206};
double input;
double output;
cin>>input;
int i;
for (i = 0; i < 5; i++)
{
if (x[i] <= input && x[i + 1] >= input)
{
output = (f[i] * x[i] + f[i + 1] * x[i + 1]) / (x[i] + x[i + 1]);
break;
}
}
cout>>output;
}