菜鸟问题：这个程序放在VC里面需要改什么东西，

[quedan22499]

#include <math.h>
#include <stdlib.h>
#include <iostream.h>

const double epsilon=1.e-5;//convergence condition
const long N=10000;//Loop times

double f(double x)
{
double temp;
//To Add: temp=Your Function
temp=2.*x*x*x-5*x*x+34.*x+54.;
return temp;
}

double Newton(double a, double b, double
(*pf)(double))
{
double x0=0.;
double x1=0.;
double x2=1.;

int counter=0;
while(fabs(x2-x1)>epsilon&&counter<N)
{
x0=x1;
x1=x2;
x2=x1-pf(x1)*(x1-x0)/(f(x1)-f(x0));
counter++;
}
if(counter==N)
{
cout<<"Sorry, I can't solve it!"<<endl;
exit(0);
}
else
return x2;
}

void main(void)
{
cout<<Newton(1,100,f)<<endl;
cout<<f(Newton(1,100,f))<<endl;
}
我想用消息框显示结果

[zhangyilan]

#include <Afxwin.h>
#include <math.h>
#include <stdlib.h>
#include <iostream.h>

const double epsilon=1.e-5;//convergence condition
const long N=10000;//Loop times

double f(double x)
{
double temp;
//To Add: temp=Your Function
temp=2.*x*x*x-5*x*x+34.*x+54.;
return temp;
}

double Newton(double a, double b, double
(*pf)(double))
{
double x0=0.;
double x1=0.;
double x2=1.;

int counter=0;
while(fabs(x2-x1)>epsilon&&counter<N)
{
x0=x1;
x1=x2;
x2=x1-pf(x1)*(x1-x0)/(f(x1)-f(x0));
counter++;
}
if(counter==N)
{
cout<<"Sorry, I can't solve it!"<<endl;
exit(0);
}
else
return x2;
}

void main(void)
{

//cout<<Newton(1,100,f)<<endl;
//cout<<f(Newton(1,100,f))<<endl;
CString str;
str.Format("%f",Newton(1,100,f));
::MessageBox(NULL,str,"test",MB_OK);
}
在Project->Setting->General->MicrosoftFoudtionClass->UseMFCinStaticLibrary
这样就可以了

[zhangyilan]

最好直接使用MFC向导建立基于对话框的程序
然后添加函数就可以了

[luoqy]

你最好判断一下x2=x1-pf(x1)*(x1-x0)/(f(x1)-f(x0));中的分母是否为零