?? xbessy.cpp
字號:
#include <string>
#include <fstream>
#include <iostream>
#include <iomanip>
#include "nr.h"
using namespace std;
// Driver for routine bessy
int main(void)
{
string txt;
int i,nval,n;
DP val,x;
ifstream fp("fncval.dat");
if (fp.fail())
NR::nrerror("Data file fncval.dat not found");
getline(fp,txt);
while (txt.find("Bessel Function Yn")) {
getline(fp,txt);
if (fp.eof()) NR::nrerror("Data not found in fncval.dat");
}
fp >> nval;
getline(fp,txt);
cout << endl << "Bessel Function Yn" << endl;
cout << setw(4) << "n" << setw(8) << "x";
cout << setw(16) << "actual" << setw(21) << "bessy(n,x)";
cout << endl << endl;
for (i=0;i < nval;i++) {
fp >> n >> x >> val;
cout << setw(4) << n;
cout << fixed << setprecision(2);
cout << setw(9) << x;
cout << scientific << setprecision(6);
cout << setw(19) << val << setw(19) << NR::bessy(n,x) << endl;
}
fp.close();
return 0;
}
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