?? d4r14.cpp
字號(hào):
#include <iostream.h>
#include <math.h>
#include <iomanip.h>
#include <stdlib.h>
#include <fstream.h>
#include <string>
#include <process.h>
void main()
{
//program d4r14
//driver for routine bessj0
int i;
char text[20];
double nval,actual,x;
const double pi = 3.1415926;
fstream fin;
fin.open("d:\\vc常用數(shù)值算法集\\data\\fncval.dat",ios::in);
while (strcmp(text,"Bessel")!=0)
{
fin>>text;
}
fin>>text;
fin>>text;
fin>>nval;
cout<<"Bessel Function J0 "<<endl;
fin>>text;
cout<<endl;
cout<<" x actual bessj0(x)"<<endl;
for( i = 1;i<=nval;i++)
{
fin>>x;
fin>>actual;
cout<<setprecision(4)<<setw(6)<<x;
cout<<setprecision(7)<<setw(16)<<actual;
cout<<setprecision(7)<<setw(16)<<bessj0(x)<<endl;
}
}
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