c++ - 使用 string.h 制作简单的 String 类

Question

我必须使用 string.h 构建一个 String 类(当您看到代码时您就会明白)。请原谅我糟糕的英语。我不知道问题出在哪里。它只是崩溃而没有任何错误消息。

(String.h)

#ifndef _STRING_H
#define _STRING_H

class String{
public:
    char* s1;
    char* s2;
    char* stemp;


    //The Constructors
    String();
    String(char* so);
    String(char* so, char* st);

    //Member Functions
    int slength(char* s1);  //Calculate the length of Sting
    void scopy(char* so,const char* st);    // copy string value to another String


};



#endif // _STRING_H

(String.cpp)

#include <string.h>
#include "String.h"

//The Constructors
String::String(){}

String::String(char* so){
    s1 = so;
}
String::String(char* so, char* st){
    s1 = so;
    s2 = st;
}


//Member Functions

int String::slength(char* so){
    return strlen(so);
}

void String::scopy(char* so,const char* st){

    strcpy(so,st);
}

(main.cpp)

#include <iostream>
#include "String.h"


using namespace std;

int main()
{

    String str("Hello","World");


    cout<<"The First  String is : "<<str.s1<<endl;
    cout<<"The Second String is : "<<str.s2<<endl;
    cout<<"-------------------------------------"<<endl;

    cout<<"The First String contains "<<str.slength(str.s1)<<" Letters"<<endl;
    cout<<"The Second String contains "<<str.slength(str.s2)<<" Letters"<<endl;

    cout<<"-------------------------------------"<<endl;

    cout<<"Copying The Second String in the First String . . ."<<endl;
    str.scopy(str.s1,str.s2);
    cout<<"The First  String is : "<<str.s1<<endl;
    cout<<"The Second String is : "<<str.s2<<endl;


    return 0;
}

Answer 1

一个字符串文字被分配给 str.s1，并作为 strcpy 的第一个参数传递给 String::scopy() >。这非常糟糕，因为不允许修改字符串文字。