some math problems in C Post: 302132686

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Top Forums Programming some math problems in C Post 302132686 by cdfd123 on Sunday 19th of August 2007 12:30:18 AM

08-19-2007

Registered User

some math problems in C

I want to calculate secant method using C language
That is a program---->
#include<stdio.h>
#include<math.h>
#include<stdlib.h>
main()
{
double fx(double x);
double x0,x1,x2,f0,f1,f2,err;
int n,i;
printf("\n\n f(x) =x*x*x-5*x-7");
printf("\n\nEnter an interval [x0,x1] in"
" which root is to be found");
printf("\nx0 =");
scanf("%f",&x0); /* INTERVAL[x0,x1] is to be entered here */
printf("x1=");
scanf("%f",&x1);
printf("\n Enter the number of iterations=");
scanf("%d",&n);
printf("\npress any key for display of iterations...\n");
getchar();
i=0;
while (n > 0)
{
f0=fx(x0);
f1=fx(x1);
x2 = x1-((x1-x0)/(f1-f0))*f1;
i++;
printf("\n x[%d]=%f x[%d]=%f",i,i-1,x0,i,x1);
printf("\n f[%d]=%f f[%d]=%f",i,i-1,f0,i,f1);
printf("\n x[%d]=%f",i+1,x2);
x0=x1;
x1=x2;
getchar();
}
printf("\n\nThe value of root is =%f",x2);
}
double fx(double x)
{
double f;
f=x*x*x-5*x-7;
return(f);
}

But while running not the erreo is displayed but the results displayed is
f(x) =x*x*x-5*x-7

Enter an interval [x0,x1] in which root is to be found
x0 =2.5
x1=3

Enter the number of iterations=4

press any key for display of iterations...

x[1]=0.000000 x[0]=0.000000
f[1]=-7.000000 f[0]=-7.000000
x[2]=inf

Means not able to calculate root as seen in the output it is x[1]=0...

so what will be the problem????

cdfd123

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LEARN ABOUT SUNOS

j1l

j0(3M)							  Mathematical Library Functions						    j0(3M)

NAME

       j0, j0f, j0l, j1, j1f, j1l, jn, jnf, jnl - Bessel functions of the first kind

SYNOPSIS

       cc [ flag... ] file... -lm [ library... ]
       #include <math.h>

       double j0(double x);

       float j0f(float x);

       long double j0l(long double x);

       double j1(double x);

       float j1f(float x);

       long double j1l(long double x);

       double jn(int n, double x);

       float jnf(int n, float x);

       long double jnl(int n, long double x);

DESCRIPTION

       These functions compute Bessel functions of x of the first kind of orders 0, 1 and n respectively.

RETURN VALUES

       Upon successful completion, these functions return the relevant Bessel value of x of the first kind.

       If x is NaN, a NaN is returned.

ERRORS

       No errors are defined.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |See below.		   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

       The j0(), j1(), and jn() functions are Standard. The j0f(), j0l(), j1f(), j1l(), jnf(), and jnl() functions are Stable.

SEE ALSO

       isnan(3M), y0(3M), math.h(3HEAD), attributes(5), standards(5)

SunOS 5.10							    1 Sep 2002								    j0(3M)

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