bisection in C++

#include <iostream>

#include <math.h>

#include <conio.h>

using namespace std;

float fungsi(float x)

{

float y = pow(x, 0.666666) + log(x) ;

return y ;

}

int main()

{

m:

float xl,xh,xr,yr;

cout << ” fungsi : y = x^(2/3) + ln (x) ” << “\n”;

cout << “:: Kita akan mencari nilai x dimana y = 0, dengan metode bisection ::”<< “\n”;

cout << “Masukkan batas bawah : “; cin >> xl;

cout << “Masukkan batas atas  : “; cin >> xh;

for (int n=0;n<1000;++n)

{

xr = (xl+xh)/2;

yr = fungsi(xr);

cout << xr << “:::::” << yr << “\n”;

if(yr<0.00001 && yr>-0.00001)

{

cout << “Hasil akarnya adalah : ” << xr <<endl;

getch();

return 0;

}

else if (yr < 0 )

xl = xr;

else

xh = xr;

}

if (yr>0.00001)

{ cout << “Batas anda salah, ubahlah…!”<<”\n”;

goto m;

}

if (yr=’error’)

{ cout << “fungsi ln gak ada yg negatif… ubah batasnya kuncup!”<<”\n\n\n”;

goto m;

}

getch ();

return 0;

}

#include <iostream>

#include <math.h>

#include <conio.h>

using namespace std;

float fungsi(float x)

{

float y = pow(x, 0.666666) + log(x) ;

return y ;

}

int main()

{

m:

float xl,xh,xr,yr;

cout << ” fungsi : y = x^(2/3) + ln (x) ” << “\n”;

cout << “:: Kita akan mencari nilai x dimana y = 0, dengan metode bisection ::”<< “\n”;

cout << “Masukkan batas bawah : “; cin >> xl;

cout << “Masukkan batas atas  : “; cin >> xh;

for (int n=0;n<1000;++n)

{

xr = (xl+xh)/2;

yr = fungsi(xr);

cout << xr << “:::::” << yr << “\n”;

if(yr<0.00001 && yr>-0.00001)

{

cout << “Hasil akarnya adalah : ” << xr <<endl;

getch();

return 0;

}

else if (yr < 0 )

xl = xr;

else

xh = xr;

}

if (yr>0.00001)

{ cout << “Batas anda salah, ubahlah…!”<<”\n”;

goto m;

}

if (yr=’error’)

{ cout << “fungsi ln gak ada yg negatif… ubah batasnya kuncup!”<<”\n\n\n”;

goto m;

}

getch ();

return 0;

}