pex5_8.cpp

来自「数据结构C++代码,经典代码,受益多多,希望大家多多支持」· C++ 代码 · 共 44 行

#include <iostream.h>
#include <iomanip.h>
#pragma hdrstop

#include "pex5_8.h"

void main (void)
{
	Calculator C;
	double x = 0.0;
	int i;

	cout.setf(ios::scientific);
	cout.precision(14);

	C.Variable();
	
	cout << endl << setw(10) << "x" << setw(37)
             << "(x*x+1)/(x**4+x**2+5x+3)" << endl << endl;
	
	cout << x << "     " << C.Eval(x) << endl;
	for(i=0, x = 10.0;i < 8;i++,x *= 10.0)
		cout << x << "     " << C.Eval(x) << endl;
}

/*
<Run>

Enter a postfix expression in the variable x. Terminate with '='
x 2 ^ 1 + x 4 ^ 8 x 2 ^ * + 5 x * + 3 + / =

         x             (x*x+1)/(x**4+x**2+5x+3)

0.00000000000000e+00     3.33333333333333e-01
1.00000000000000e+01     9.30618262231641e-03
1.00000000000000e+02     9.99295537113757e-05
1.00000000000000e+03     9.99992995053075e-07
1.00000000000000e+04     9.99999929995005e-09
1.00000000000000e+05     9.99999999299995e-11
1.00000000000000e+06     9.99999999993000e-13
1.00000000000000e+07     9.99999999999930e-15
1.00000000000000e+08     9.99999999999999e-17
*/