Practical set 5 (Secant Method)

#include<stdio.h>

#include<stdlib.h>

#include<math.h>

 

float fun(float x)

 {

    x=(x*sin(x))-1;

//  x=4*(pow(x,3))-(2*x)-6;

 //   x=x-(exp(1)*x)+2;

    return x;

 }

   

  float iteration(float a, float b)

  {

    float x;

x=((a*fun(b))-(b*fun(a)))/(fun(b)-fun(a));

      return x;

  }

   

 int main()

  {

      int i,n;

      int p[20];

      float a,b,x[10];

       

      printf("\nQuestion is : 4x^3-2x-6=0 \n");

      printf("\nEnter how many iteration : ");scanf("%d",&n);

       

  for(i=0;i<n;i++)

   {

       p[i]=fun(i);

       printf("\n f[%d] : %d ",i,p[i]);

   }

    

   for(i=0;i<n;i++)

    {

        if(p[i]*p[i+1]<0)

         {

            a=i;

            b=i+1;

            printf("\nThe root lies between : [%0.4f %0.4f]",a,b);

            break;

            }      

        }

        x[0]=a;

        x[1]=b;

        printf("\n x[0] : %f  ",x[0]);

        printf("\n x[1] : %f  ",i,x[1]);

        for(i=2;i<n;i++)

        {

            x[i]=iteration(x[i-2],x[i-1]);

            printf("\n x[%d] : %f  ",i,x[i]);

        }

return 0;

 }













by meet kheni