F Lagrange's Interpolation in C code | CodeTheta

Lagrange's Interpolation in C code

January 09, 2014


/******************************************

         Lagrange's Interpolation

 ******************************************/
/* http://native-code.blogspot.com */

#include<stdio.h>
#include<conio.h>
#define MAX 20

void main()
{
   float s,p,z;
   float x[MAX],y[MAX];
   int i,n,j,k;
   s=0.0F; p=1.0F;
   clrscr();
   //--------------------------
   
   printf("\nEnter the total number of terms:");
   scanf("%d",&n);
    
   printf("\n\nEnter the table");
   printf("\nX\tY\n");
   
   for(i=0;i<n;i++)
   {
      scanf("%f",(x+i));
      scanf("%f",(y+i));
   }
   
   //--------------------------
   
   printf("\nEnter the interpolation point:");
   scanf("%f",&z);
   
   //--------------------------
   
   for(k=0;k<n;k++)
   {
      p=1.0F;
      for(j=0;j<n;j++)
      {
         if(j!=k)
             p*=((z-x[j])/(x[k]-x[j]));
      }
      s+=(y[k]*p);
      printf("\nSum=%f",s); // DEBUG DATA
   }

   printf("\n\n\nRESULT BY LAGRANGE'S INTERPOLATION:%.3f",s);
   getch();
} // end of main
 /* http://native-code.blogspot.com */

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