方程求解

求一元二次方程的根。

 

 

#include <iostream>
#include <cmath>//使用#include 时必须声明在std命名空间：using namespace std;




using namespace std;

int main()
{
    float a,b,c,x1,x2;

    cin >> a >> b >> c;

    x1 = ( -b + sqrt( b * b - 4 * a * c ) ) / ( 2 * a );
    x2 = ( -b - sqrt( b * b - 4 * a * c ) ) / ( 2 * a );

    cout << " x1 = " << x1 << endl ;
    cout << " x2 = " << x1 << endl ;
    
    return 0;
}

 

运行时出错了……

error LNK2005: _main already defined in code.obj
Debug/code.exe : fatal error LNK1169: one or more multiply defined symbols found

 

出了什么问题啊？