引入类型struct(结构），提高代码的逻辑性和可读性

创建一个新类型（struct, 即 结构）SComplex 来表示复数，提高了代码的逻辑性和可读性，代码更加的简洁。

#include "stdafx.h"
#include "iostream"
using namespace std;

struct SComplex
{
    double dReal;
    double dImg;
};

SComplex ComplexAdd(SComplex c1,SComplex c2)
{
    SComplex c;
    c.dReal = c1.dReal + c2.dReal;
    c.dImg = c1.dImg + c2.dImg;
    return c;

}

double Rand(double dMin, double dMax)
{

    double dVal = (double)rand() / RAND_MAX;
    return dMin + dVal * (dMax - dMin);

}

int _tmain(int argc, _TCHAR* argv[])
{
    SComplex c1;
    c1.dReal = Rand(-, );
    c1.dImg = Rand(-, );

    SComplex c2;
    c2.dReal = Rand(-, );
    c2.dImg = Rand(-, );

    SComplex c = ComplexAdd(c1, c2);
    cout << c.dReal << "+" << c.dImg << endl;
    getchar();
    return ;
}