Help with C++ program execution. Post: 302569768

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Top Forums Programming Help with C++ program execution. Post 302569768 by poonam.gaigole on Tuesday 1st of November 2011 12:16:31 PM

11-01-2011

Registered User

Help with C++ program execution.

//Find the root of the equation (x^2)-2 by bisection method.

Code:

#include<iostream>
using namespace std;
double a,x;
double f(double x)
{
    return ((x*x)-2);
}                                         //Suppose the function is (x*x)-2.
void calcx(double a1,double b1)
    {
        x = (a1+b1)/2;
        while((f(x)*f(a))!=0)                //If f(x)*f(a)=0, then the root is 'x' itself!
        {
            if(f(x)*f(a) < 0)
            {
                if(x==1.41421509)                               //The answer should be 1.414... so given like this!
                {
                    cout<<"Process completed!";
                    cout<<"Result is: "<<x;
                }
                a1=x;                                       //The value 'a' is replaced by x and 'b' remains the same.
                calcx(a1,b1);                               //Then, we'll do recurrsion for range (x,b)
            }
            else if(f(x)*f(a) > 0)
            {
                if(x==1.41421509)
                {
                    cout<<"Process completed!";
                    cout<<"Result is: "<<x;
                }
                b1=x;
                calcx(a1,b1);                               //Here, recurrsion is done for range (a,x).
            }
        }
    }
int main()
{
    double b,res;                               
    cout<<"Enter the values of 'a' and 'b': ";
    cin>>a>>b;                                            //The range already given.
    calcx(a,b);
    return 0;
}

OUTPUT:

Segmentation fault

Q. Can i know why this kind of message is being displayed?

poonam.gaigole

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LEARN ABOUT REDHAT

j1l

J0(3)							     Linux Programmer's Manual							     J0(3)

NAME

       j0, j0f, j0l, j1, j1f, j1l, jn, jnf, jnl, y0, y0f, y0l, y1, y1f, y1l, yn, ynf, ynl - Bessel functions

SYNOPSIS

       #include <math.h>

       double j0(double x);
       double j1(double x);
       double jn(int n, double x);
       double y0(double x);
       double y1(double x);
       double yn(int n, double x);

       float j0f(float x);
       float j1f(float x);
       float jnf(int n, float x);
       float y0f(float x);
       float y1f(float x);
       float ynf(int n, float x);

       long double j0l(long double x);
       long double j1l(long double x);
       long double jnl(int n, long double x);
       long double y0l(long double x);
       long double y1l(long double x);
       long double ynl(int n, long double x);

DESCRIPTION

       The  j0() and j1() functions return Bessel functions of x of the first kind of orders 0 and 1, respectively.  The jn() function returns the
       Bessel function of x of the first kind of order n.

       The y0() and y1() functions return Bessel functions of x of the second kind of orders 0 and 1, respectively.  The yn() function returns the
       Bessel function of x of the second kind of order n.

       For the functions y0(), y1() and yn(), the value of x must be positive.	For negative values of x, these functions return -HUGE_VAL.

       The j0f() etc. and j0l() etc. functions are versions that take and return float and long double values, respectively.

CONFORMING TO

       The functions returning double conform to SVID 3, BSD 4.3, XPG4, POSIX 1003.1-2001. The other functions exist by analogy, and exist on sev-
       eral platforms.

BUGS

       There are errors of up to 2e-16 in the values returned by j0(), j1() and jn() for values of x between -8 and 8.

								    2002-08-25								     J0(3)