有人可以编写一下程序吗

代码如下，如有帮助，请采纳一下，谢谢。

#include <stdio.h>
int main()
{
    int i,j;
    float x[] ={0.0,3.0,1.0,5.0,4.0,2.0};
    float y[] ={0.0,68.0,20.0,110.0,77.0,60.0};
    float tmp,xn,yn;
    //排序从小到大排序
    for (i=0;i<5;i++)
    {
        for (j=0;j<5-i;j++)
        {
            if(x[j] > x[j+1])
            {
                tmp = x[j];
                x[j] = x[j+1];
                x[j+1] = tmp;

                tmp = y[j];
                y[j]=y[j+1];
                y[j+1] = tmp;
            }
        }
    }

    printf("输入x:");
    scanf("%f",&xn);
    if(xn < x[0])
    {
        yn = y[0] - (y[1]-y[0])/(x[1]-x[0]) * (x[0]-xn);
    }else if (xn > x[5])
    {
        yn = y[5] + (y[5]-y[4])/(x[5]-x[4]) * (xn - x[5]);
    }else
    {
        for (i=0;i<6;i++)
        {
            if(xn < x[i])
                break;
        }

        yn = y[i-1] + (y[i]-y[i-1])/(x[i]-x[i-1]) * (xn - x[i-1]);

    }
    printf("y = %.1f\n",yn);
    return 0;

}