Lagrangian Interpolation in numerical method

/*
#include
#include
#define max 10
void main()
{
int n,i,j;
float x[max],f[max],fp,lf,sum,xp;
clrscr();
printf("\nInput number of data points, n ");
scanf("%d",&n);
printf("\nInput data points x[i] and values f[i] \n");
printf("(one set in each line)\n");
for(i=0;in;i++) i="0;in;i++)" x="%f" fp="sum;" sum="0.0;" lf="1.0;" j="0;jn;j++)">
#include
#define max 10
void main()
{
int n,i,j;
float x[max],f[max],fp,lf,sum,xp;
clrscr();
printf("\nInput number of data points, n ");
scanf("%d",&n);
printf("\nInput data points x[i] and values f[i] \n");
printf("(one set in each line)\n");
for(i=0;i {
scanf("%f %f",&x[i], &f[i]);
}
printf("\nInput value at which interpolation is required, xp ");
scanf("%f",&xp);
sum=0.0;
for(i=0;i {
lf=1.0;
for(j=0;j {
if(i!=j)
{
lf=lf*(xp-x[j])/(x[i]-x[j]);
}
}
sum=sum+lf*f[i];
}
fp=sum;
printf("\nLagrangian Interpolation \n\n");
printf("Interpolated function value \n");
printf("at x = %f is %f \n",xp,fp);
getch();
}
*/