Implementation of Regula Falsi Method in C.

Here is the code..

//AIM: TO SOLVE A GIVEN EQUATION BY REGULA FALSI //METHOD

#include<stdio.h>

float fx(float );

void main()

{

float a,b,i,x,y;

int j,n;

printf("Given equation is fx = x^3-x^2-2 \n");

for(i=1;fx(i)>0;)

i-=0.2;

a=i;

for(i=1;fx(i)<0;)

i+=0.2;

b=i;

printf("enter the no. of iterations \n");

scanf("%d", &n);

for(j=0;j<n;j++)

{

y = (fx(b)/(fx(b)-fx(a)));

x = (b-((b-a)*y));

if(fx(x)<0)

{

printf("root after %d iteration is %f\n",(j+1),x);

a = x;

}

else

{

printf("root after %d iteration is %f\n",(j+1),x);

b = x;

}

}

printf("so the root is %f \n",x);

}

float fx(float m)

{

float f;

f = ((m*m*m)-(m*m)-2);

return(f);

}

For Turbo C users..

//AIM: TO SOLVE A GIVEN EQUATION BY REGULA FALSI METHOD

#include<stdio.h>

#include<conio.h>

float fx(float );

void main()

{

float a,b,i,x,y;

int j,n;

clrscr();

printf("Given equation is fx = x^3-x^2-2 \n");

for(i=1;fx(i)>0;)

i-=0.2;

a=i;

for(i=1;fx(i)<0;)

i+=0.2;

b=i;

printf("enter the no. of iterations \n");

scanf("%d", &n);

for(j=0;j<n;j++)

{

y = (fx(b)/(fx(b)-fx(a)));

x = (b-((b-a)*y));

if(fx(x)<0)

{

printf("root after %d iteration is %f\n",(j+1),x);

a = x;

}

else

{

printf("root after %d iteration is %f\n",(j+1),x);

b = x;

}

}

printf("so the root is %f \n",x);

getch();

}

float fx(float m)

{

float f;

f = ((m*m*m)-(m*m)-2);

return(f);

}