#include<windows.h>
#include<iostream>
#include<time.h>
using std::cin;
using std::cout;
using std::endl;//复杂化
//测试函数1==============
int text_1(double i,double j)
{
int delay_time=3000; //延时3s
if(i>=j)
{
Sleep(delay_time);
return i*10000;
}
else
{
Sleep(delay_time);
return j*10000;
}
}
//测试函数2==================
int text_2(double *i,double *j)
{
int delay_time=3000; //延时3s
if(*i>=*j)
{
Sleep(delay_time);
return *i*10000;
}
else
{
Sleep(delay_time);
return *j*10000;
}
}
//测试函数3======================
int text_3(double &i,double &j)
{
int delay_time=3000; //延时3s
if(i>=j)
{
Sleep(delay_time);
return i*10000;
}
else
{
Sleep(delay_time);
return j*10000;
}
}
//===========================
int main(void)
{
double num1,num2;
clock_t start,stop; //定义时钟
start = clock(); //开始时间
cout<<"Enter the num1 is ";
cin>>num1;
cout<<"Enter the num2 is ";
cin>>num2;
cout<<"The large number * 10000 is ";
cout<<text_1(num1,num2)<<" --> "<<(clock()-start)<<"ms"<<endl;
// 2) cout<<text_2(&num1,&num2)<<" --> "<<(clock()-start)<<"ms"<<endl;
// 3) cout<<text_3(num1,num2)<<" --> "<<(clock()-start)<<"ms"<<endl;
return 0;
}
测试环境VC6，本人测试的结果是，传地址>值传递>传引用(很让我奇怪)
问题 1.请大家测试执行，说出效率的结果（？>？>？）?
2.以上测试代码有没不足、错误？该测试是否真能体现该效率的问题？
3.效率分析
4.从编译原理说说该三类是怎么样执行的？
4.传值、传地址与传引用各有什么优劣？一般用于怎样的代码？
请大家各抒己见、广泛讨论，错误没关系~~
