C String類的實現

2021-10-05 09:22:33 字數 3290 閱讀 7752

京東一面 開始面試官就讓自己實現乙個string類，方法寫出基本的就可以，沒告訴具體寫什麼，可能是由於時間原因（一共面了30min）,我寫了建構函式以及賦值構造，析構，面試官就讓我停止了。

底層主要是借助字元陣列來實現

class


string


;
string::


string()


string::


string


(char


* str)


string::


string


(const string& other)


string::


~string()


string& string::


operator=(


char


* str)


string& string::


operator=(


const string& other)


delete


str_;


int len =


strlen


(other.str_)+1


; str_ =


newchar


[len]


;memset


(str_,


0, len)


;strcpy


(str_, other.str_)


;return


*this;}


char


& string::


operator


(unsigned


int index)


return


const_cast


<


char


&>


(static_cast


<


const string&


>(*


this


)[index]);


}const


char


& string::


operator


(unsigned


int index)


const


return str_[index];}


string operator+(


const string& s1,


const string & s2)


string& string::


operator+=


(const string & s)


bool string::


operator==(


const string& s)


istream&


operator


>>


(istream& in, string& s)


ostream&


operator


<<


(ostream& out,


const string& s)


int


main()
輸出結果：

測試建構函式


不傳參：


不傳參：1


字元陣列引數：hello


string 型別引數：hello


測試賦值建構函式


字元陣列引數：hello


string型別引數：hello


測試下標運算子


在字串長度範圍內：h


不在字串長度範圍內：o


測試+：


hellohello


測試+=：


hellohello


測試==


10
#include


using


namespace std;


class


string


;string::


string()


string::


string


(char


* str)


string::


string


(const string& other)


string::


~string()


string& string::


operator=(


char


* str)


string& string::


operator=(


const string& other)


delete


str_;


int len =


strlen


(other.str_)+1


; str_ =


newchar


[len]


;memset


(str_,


0, len)


;strcpy


(str_, other.str_)


;return


*this;}


char


& string::


operator


(unsigned


int index)


return


const_cast


<


char


&>


(static_cast


<


const string&


>(*


this


)[index]);


}const


char


& string::


operator


(unsigned


int index)


const


return str_[index];}


string operator+(


const string& s1,


const string & s2)


string& string::


operator+=


(const string & s)


bool string::


operator==(


const string& s)


istream&


operator


>>


(istream& in, string& s)


ostream&


operator


<<


(ostream& out,


const string& s)


intmain()

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