?? d4r21.cpp
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#include <iostream.h>
#include <math.h>
#include <iomanip.h>
#include <stdlib.h>
#include <fstream.h>
#include <string>
#include <process.h>
void main()
{
//program d4r21
//driver for routine bessk0
int i;
char text[20];
double nval,value,x;
const double pi = 3.1415926;
fstream fin;
fin.open("d:\\vc常用數值算法集\\data\\fncval.dat",ios::in);
while ( strcmp(text,"K0")!=0)
{
fin>>text;
}
fin>>nval;
fin>>text;
cout<<"Modified Bessel Function K0 "<<endl;
cout<<endl;
cout<<" x actual bessk0(x)"<<endl;
for( i = 1;i<=nval;i++)
{
fin>>x;
fin>>value;
cout<<setprecision(2)<<setw(8)<<x;
cout<<setprecision(8)<<setw(18)<<value;
cout<<setprecision(8)<<setw(18)<<bessk0(x)<<endl;
}
}
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