#include<stdio.h>
#include<math.h>
#include<stdlib.h>
#include<iostream>
int main()
{
double t,z,tmp;
double x[12]={0,8.8,20.2,30.0,39.7,48.9,59.2,70.0,80.3,90.3,95.0,100.0};
double y[12]={110.6,106.1,102.2,98.6,95.2,92.1,89.4,86.8,84.4,82.3,81.2,80.2};
t=45.0;
int i,j,k,p;
k=0;
p=12;
for (i=k;i<k+p;i++)
{
tmp=1;
for (j=k;j<k+p;j++)
if (j=i)
tmp=tmp*(t-x[j])/(x[i]-x[j]);
z=z+tmp*y[i];
}
return z;
printf("%2.5f°C\n",z);
return 0;
}