作者wendychang (柯南42真是妙)
看板NTUBIME96-HW
标题[解答] 计程上机考Q7
时间Mon Dec 1 01:01:08 2003
#include <stdafx.h>
#include <iostream>
using std::cout;
using std::cin;
using std::endl;
#include <iomanip>
using std::fixed;
using std::setprecision;
#include <cmath>
int main()
{
float a, b, c, D;
float a, b, c, D;
cout << "请输入一元二次方程式系数a : ";
cin >> a;
cout << "请输入一元二次方程式系数b : ";
cin >> b;
cout << "请输入一元二次方程式系数c : ";
cin >> c;
cout << endl;
if ( a==0 )
{
if ( b==0 )
{
if ( c==0 )
cout << "x无限多解" << endl;
else
cout << "x无解" << endl;
}
else
cout << fixed << setprecision( 4 )
<< "x = " << -c / b << endl;
}
else
{
D = b * b - 4 * a * c;
if ( D > 0 )
cout << fixed << setprecision( 4 )
<< "x = " << ( -b + sqrt ( D ) )/ ( 2 * a )
<< " , " << ( -b - sqrt ( D ) / ( 2 * a ) << endl;
else if ( D == 0 )
cout << fixed << setprecision( 4 )
<< "x = " << -b / ( 2 * a )
<< " , " << -b / ( 2 * a ) << endl;
else
cout << fixed << setprecision( 4 )
<< "x = " << -b / ( 2 * a ) << "+"
<< sqrt( -D ) / ( 2 * a ) << "i , "
<<-b / ( 2 * a ) << "-"
<< sqrt( -D ) / ( 2 * a ) << "i" << endl;
}
cout << endl;
return 0;
}
--
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