c++ primer plus 第八章《编程题8.8.4》

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本文通过一个简单的C++程序示例介绍了如何自定义一个字符串结构体，并实现字符串的设置与显示功能。通过对字符串结构体成员变量和成员函数的定义与使用，加深了对C++中字符串操作的理解。

/*
 beany.str: Reality isn't what is used to be.
 beany.ct:33
 beany.str: Reality isn't what is used to be.
 beany.ct:33
 beany.str: Reality isn't what is used to be.
 beany.ct:33
 Duality isn't what is used to be.
 Duality isn't what is used to be.
 Duality isn't what is used to be.
 Duality isn't what is used to be.
*/
#include <iostream>
#include <cstring>

using namespace std;

struct stringy {
    char * str;     //  points to a string
    int ct;            //   length of string (not counting '\0')
};

void set(stringy & b, char test[], int i = 0);
void show(stringy & b, int i = 1);
void show(char test[], int i = 1);

//prototypes for set(), show(), and show() go here
int main() {
    stringy beany;
    char testing[] = "Reality isn't what is used to be.";
    set(beany, testing);

    show(beany);
    show(beany, 2);
    testing[0] = 'D';
    testing[1] = 'u';
    show(testing);
    show(testing, 3);
    //show("Done!");

    return 0;
}

void set(stringy & b, char test[], int i) {
    int n = (int)strlen(test);
    b.ct = n;
    b.str = new char [n];
    strcpy(b.str, test);
}

void show(stringy & b, int i) {
    while (i--) {
        cout << "beany.str: " << b.str << "\n";
        cout << "beany.ct:" << b.ct << "\n";
    }
}

void show(char test[], int i) {
    while (i--)
        cout << test << "\n";
}