# include<stdio.h>
# include<conio.h>
# include<math.h>
# include<process.h>
# include<string.h>
# define TOL 0.000001
# define F(x) (x)*log10(x) - 1.2
void Bisect();
int i=1, n;
float raiz = 1;
void main(){
printf("\n Solucion por el Metodo de Biseccion \n");
printf ("\n La ecuacion es: ");
printf("\n\t\t\t (x)*log10x) -1.2 = 0 \n\n");
printf("Numero Maximo de Iteracciones: ");
scanf ("%d",&n);
Bisect();
}
void Bisect(){
float x1,x2,x0;
float f0,f1,f2;
int j=0;
for (x2=1;;x2++){
f2 = F(x2);
if(f2 >0){
break;
}
}
for (x1=x2-1;;x2--){
f1 = F(x1);
if(f1<0){
break;
}
}
printf ("\t\t------------------------------------\t\t");
printf ("\n\t\t Iteracion Raiz \n");
printf("\t\t-------------------------------------\t\t");
for (;i<=n;i++){
x0 = (x1+x2)/2.0;
f0 = F(x0);
if (f0==0){
raiz = x0;
}
if(f0*f1<0){
x2=x0;
}
else{
x1 = x0;
f1= f0;
}
printf("\n\t\t Iteracion %d ", i);
printf("\t :\t %f", x0);
if(fabs((x1-x2)/x1) < TOL ){
printf("\n\t\t ------------------------------------");
printf("\n\t\t Raiz = %f",x0);
printf("\n\t\t Iteracion = %d\n",i);
printf("\t\t-------------------------------------");
getch();
exit(0);
}
}
printf("\n\t\t---------------------------------------");
printf("\n\t\t\t Raiz = %7.5f",x0);
printf("\n\t\t\t Iteracion = %d\n", i-1);
printf("\t\t-----------------------------------------");
getch();
}
Ejecutando:
