pbyvalue.cpp

来自「C++&datastructure书籍源码,以前外教提供现在与大家共享」· C++ 代码 · 共 37 行

#include <iostream>
#include <string>
using namespace std;

// illustrates pass-by-value/pass-by-reference semantics

void DoStuff(int number, string & word)
{
    cout << "DoStuff in:\t" << number << " " << word << endl;
    number *= 2;
    word = "What's up Doc?";
    cout << "DoStuff out:\t" << number << " " << word << endl;    
}

void DoStuff2(int & one, int & two, string & word)
{
    cout << "DoStuff2 in:\t" << one << " " << two << " " << word << endl;
    one *= 2;
    cout << "DoStuff2 mid:\t" << one << " " << two << " " << word << endl;
    two += 1;
    word = "What's up Doc?";
    cout << "DoStuff2 out:\t" << one << " " << two << " " << word << endl;
}

int main()
{
    int num = 30;
    string name = "Bugs Bunny";

    DoStuff(num,name);    
    cout << endl << "DoStuff main:\t" << num << " " << name << endl << endl;

    DoStuff2(num,num,name);
    cout << endl << "DoStuff2 main:\t" << num << " " << name << endl;
    return 0;
}