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# PROGRAM FOR REGULAR-FALSI GENERAL METHOD

Posted By: Rafael Costa     Category: C Programming     Views: 27570

## Code for PROGRAM FOR REGULAR-FALSI GENERAL METHOD in C Programming

```#include<conio.h>
#include<stdio.h>
#include<stdlib.h>
#include<math.h>
#define e 0.0001

int user_power,i=0,cnt=0,flag=0;
int coef[10]={0};
float x1,x2,x3=0,t=0;
float fx1=0,fx2=0,fx3=0,temp=0;
int check()
{
printf("\n\tINTIAL X1---->");
scanf("%f",&x1);

printf("\n\tINTIAL X2---->");
scanf("%f",&x2);

fx1=fx2=fx3=0.0;

for(i=user_power;i>=1;i--)
{
fx1+=coef[i] * (pow(x1,i)) ;
fx2+=coef[i] * (pow(x2,i))  ;
}
fx1+=coef[0];
fx2+=coef[0];
if( (fx1*fx2)>0)
{
printf("\n\t INTIAL VALUES ARE NOT PERFECT.");
return(1);
}
return(0);
}

void main()
{

clrscr();
printf("\n\n\t\t\t PROGRAM FOR REGULAR-FALSI GENERAL");

printf("\n\tENTER THE TOTAL NO. OF POWER:::: ");
scanf("%d",&user_power);

for(i=0;i<=user_power;i++)
{
printf("\n\t x^%d::",i);
scanf("%d",&coef[i]);
}

printf("\n");

printf("\n\t THE POLYNOMIAL IS ::: ");
for(i=user_power;i>=0;i--)//printing coeff.
{
printf(" %dx^%d",coef[i],i);
}

while(1)
{
if(check()==0)
{
flag=1;
break;
}
check();
}

printf("\n ******************************************************");
printf("\n ITERATION    X1    FX1    X2    FX2     X3       FX3   ");
printf("\n **********************************************************");

if(flag==1)
{

do
{
cnt++;
fx1=fx2=fx3=0;
for(i=user_power;i>=1;i--)
{
fx1+=coef[i] * (pow(x1,i)) ;
fx2+=coef[i] * (pow(x2,i))  ;
}
fx1+=coef[0];
fx2+=coef[0];
temp=x3;
x3=((x1*fx2)-(x2*fx1))/(fx2-fx1);

for(i=user_power;i>=1;i--)
{
fx3+=coef[i]*(pow(x3,i));
}
fx3+=coef[0];

printf("\n %d     %.4f  %.4f  %.4f  %.4f  %.4f  %.4f",cnt,x1,fx1,x2,fx2,x3,fx3);
t=fx1*fx3;
if(t>0)
{
x1=x3;

}
if(t<0)
{
x2=x3;
}
fx3=0;
}while((fabs(temp-x3))>=e);
printf("\n\t ROOT OF EQUATION IS ::::: %f",x3);
}
getch();
}
/*******************************OUTPUT**********************************/
ENTER THE TOTAL NO. OF POWER:::: 3

x^0::-6

x^1::-2

x^2::0

x^3::4

THE POLYNOMIAL IS :::  4x^3 0x^2 -2x^1 -6x^0
INTIAL X1---->1.25

INTIAL X2---->1.50

**********************************************************
ITERATION    X1    FX1    X2    FX2     X3       FX3
**********************************************************
1     1.2500  -0.6875  1.5000  4.5000  1.2831  -0.1159
2     1.2831  -0.1159  1.5000  4.5000  1.2886  -0.0188
3     1.2886  -0.0188  1.5000  4.5000  1.2895  -0.0030
4     1.2895  -0.0030  1.5000  4.5000  1.2896  -0.0005
5     1.2896  -0.0005  1.5000  4.5000  1.2896  -0.0001
************************************************************

ROOT OF EQUATION IS ::::: 1.289620
```
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 Rafael Costa author of PROGRAM FOR REGULAR-FALSI GENERAL METHOD is from Salvador, Brazil. View All Articles

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