?? d4r19.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 d4r19
//driver for routine bessj
int i,n;
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,"Jn,")!=0)
{
fin>>text;
}
fin>>text;
fin>>nval;
fin>>text;
cout<<"Bessel Function Jn "<<endl;
cout<<endl;
cout<<" n x actual bessj(n,x)"<<endl;
for( i = 1; i<=nval; i++)
{
fin>>n;
fin>>x;
fin>>value;
cout<<setw(6)<<n;
cout<<setw(8)<<x;
cout<<setw(18)<<value;
cout<<setw(18)<<bessj(n,x)<<endl;
}
}
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