Lagranges formula using C 



Sumit Kar, Numerical Methods, C, Timus Rak



/*

Lagranges formula

x: 30 35 45 55
y: 148 196 68 34
Compute::f(40)=?
*/
#include<conio.h>
#include<stdio.h>
#define n 4
void main()
{
 float f,x[n],y[n],xf,fx;
 int j,i;
 for(i=0;i<n;i++)
 {
 printf("\nEnter x[%d] & y[%d]",i+1,i+1);
 scanf("%f%f",&x[i],&y[i]);
 }
 printf("\nEnter x");
 scanf("%f",&xf);
 fx=0;
 for(i=0;i<n;i++)
 {
  f=1;
  for(j=0;j<n;j++)
  {
 if(i!=j)
 f=f*((xf-x[j])/(x[i]-x[j]));
  }
  fx=fx+(f*y[i]);
 }
 printf("\nResult %f",fx);
 getch();
}








































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