?? d3r7.cpp
字號:
#include "iostream.h"
#include "math.h"
double func(double x)
{
return x * exp(-x);
}
void main()
{
//program d3r7
//driver for routine qgaus
double x,ss,aaa,dx, x1 = 0.0;
double x2 = 5.0;
int nval = 10;
dx = (x2 - x1) /(double)nval;
cout<<endl;
cout<<" 0.0to qgaus expected"<<endl;
cout.setf(ios::fixed|ios::right);
for (int i = 1; i<=nval; i++)
{
x = x1 + (double)i * dx;
qgaus(x1, x, ss);
cout<<" "<<x;
cout.precision(6);
cout.width(14);
cout<<ss;
aaa = -(1.0 + x) * exp(-x) + (1.0 + x1) * exp(-x1);
cout.width(14);
cout<<aaa<<endl;
}
}
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