?? zbrac.cpp
void zbrac(double &x1, double &x2, bool &succes)
{
int j,ntry;
double factor,f1,f2;
factor = 1.6;
ntry = 50;
if (x1 == x2) cout<<"you have to guess an initial range"<<endl;
f1 = fun(x1);
f2 = fun(x2);
succes = true;
for (j = 1; j<=ntry; j++)
{
if ((f1 * f2) < 0.0)
goto loop;
if (fabs(f1) < fabs(f2))
{
x1 = x1 + factor * (x1 - x2);
f1 = fun(x1);
}
else
{
x2 = x2 + factor * (x2 - x1);
f2 = fun(x2);
}
}
succes = false;
loop:cout<<endl;
}
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