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Graeffe Method

Posted By: Luane Fischer     Category: C Programming     Views: 4454

Program for Graeffe Method.

Code for Graeffe Method in C Programming

#include<stdio.h>
#include<conio.h>
#include<math.h>
void main()
{
    float coe[10],sq[10],mul[10]={0},ans[10],f_ans[10];
    float temp,div=0.5;
    int c,po,ctr,ctr1,ctr2,N;
    clrscr();

    printf("\nEnter the Highest Power::");
    flushall();
    scanf("%d",&po);
    N=po;

//Scanning Equationfor(ctr=po;ctr>=0;ctr--)
    {
        printf("\nEnter the value of %d=   ",ctr);
        scanf("%f",&coe[ctr]);
    }

    do
    {   c=po;
//Squaring the value:for(ctr=po;ctr>=0;ctr--)
    {
        sq[ctr]=coe[ctr]*coe[ctr];
    }
//Multiplying & placing in another arrayfor(ctr=po,ctr1=po-1;ctr>=0,ctr1>0;ctr--,ctr1--)
    {
        mul[ctr1]=(coe[ctr]*coe[ctr-2])*(-2);
    }
//Adding the sq[] with mul[]for(ctr=po;ctr>=0;ctr--)
    {
        ans[ctr]=sq[ctr]+mul[ctr];
    }
//Dividing the valuesfor(ctr=0;ctr<=po;ctr++)
    {
        temp=ans[ctr]/ans[ctr+1];
        f_ans[ctr]=pow(temp,div);
    }
    for(ctr=0;ctr<=po;ctr++)
    {
        printf("\n%.4f",f_ans[ctr]);
    }
    div=div/2;
    c--;

    }
    while(c!=0);
    getch();
}
  
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Luane Fischer
Luane Fischer author of Graeffe Method is from Frankfurt, Germany.
 
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Pierre Logipar from France Comment on: Oct 12
it doesn't work properly:
for x*x-2=0 your answer is: 1.0000 2.0000 inf 1.0000 1.4142 inf
the right answer is: -1.4142 1.4142

can you correct your mistakes?

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