C code - Lagrange's Interpolation

//To do Lagrange's interpolation

//By Mahesha MG, MIT

#include<stdio.h>

main()

{

int i,j,k,n;

float x[10],y[10],l[10],f,val=0;

clrscr();

printf("Enter total number of points (n): ");

scanf("%d",&n);

printf("Enter data points (x <space> y)\n");

            for (i=0;i<n;i++)

       {

            scanf("%f%f",&x[i],&y[i]);

            }

 printf("\nEnter x value: ");

 scanf("%f",&f);

 for(i=0;i<n;i++)

 {

 l[i]=y[i];

 for(j=0;j<n;j++)

 {

 if(i!=j)

  l[i]*=(f-x[j])/(x[i]-x[j]);

  }

  val+=l[i];

  }

 printf("At x = %f, y = %f",f,val);

}