#ifndef cstring2_hpp
#define cstring2_hpp
// cstring2 優化版本的cstring 增強版本
#include
#include
#include
class cstring2
operator const char* ()
cstring2(const char* p);
cstring2(const cstring2& str);
cstring2();
~cstring2();
cstring2 &operator=(const cstring2& str);
cstring2 &operator=(const char* str);
cstring2 &operator+=(const cstring2& str);
cstring2 operator+(const cstring2& str2);
int find(const char* pszsub,int size = 0);
int find(char ch,int istart = 0 );
//void makelower(char* str);
cstring2 makelower(cstring2 str);
cstring2 &makelower();
cstring2& makeupper();
cstring2& makereverse();
cstring2 mid(int ifirst,int ncount) const;
cstring2 mid(int ifirst) const
//從左邊開始擷取到底幾個
cstring2 left(int ncount) const
//從滴幾個開始擷取
cstring2 right(int ncount) const
char operator(int nindex) const
char &operator(int nindex)
private:
int m_nlenght;
char* m_pdata;
cstring2(int nlen)
};#endif /* cstring2_hpp */
cstring ---- cpp
#include "cstring2.hpp"
cstring2::cstring2(const char* p)
cstring2::cstring2(const cstring2& str)
cstring2::cstring2()
cstring2::~cstring2()
//物件間賦值
cstring2 &cstring2::operator=(const cstring2& str)
strcpy(m_pdata, str.m_pdata);
m_nlenght = nlen;
return *this;
}cstring2 &cstring2::operator=(const char* str)
strcpy(m_pdata,str);
m_nlenght = nlen;
return *this;
}cstring2 &cstring2::operator+=(const cstring2& str)
cstring2 cstring2::operator+(const cstring2& str2)
//根據asii 碼轉換大小寫
cstring2 cstring2::makelower(cstring2 str)else if(str2[i] >= 'a' && str2[i] <= 'z')
}return str2;
}//根據asii 碼轉換大小寫
cstring2 &cstring2::makelower()else if(m_pdata[i] >= 'a' && m_pdata[i] <= 'z')
}return *this;
}//字串反轉
cstring2& cstring2::makereverse()
return *this;
}//字元擷取
cstring2 cstring2::mid(int ifirst,int ncount) const
//從第幾個開始擷取，保留剩下的
//cstring2 cstring2::mid(int ifirst) const
//int find(const char* pszsub,int size = 0)
int cstring2::find(char ch,int istart)
cpp ---- main
int main(int argc, const char * argv) {
cstring s1 = "abc",s2 = "-xyz";
s1 += s2;
std::cout << s1 << std::endl;
return 0;
int main(int argc, const char * argv) {
cstring s1 = "abc",s2 = "-xyz";
//cstring s = s1+s2;
cstring s = s1; //深拷貝
cstring s3('*',8);
// s1 = s2; //直接賦值是屬於淺拷貝
cstring s5;
s5 = s4 = "123456";
if (s1 == s4)
std::cout << "相等" << std::endl;
else
std::cout << "不相等" << std::endl;
if ("123456" != s4)
std::cout << "不等" << std::endl;
else
std::cout << "相等" << std::endl;
int i = 0;
while (i < s.getlength()) {
printf("%c",s[i]);
++i;
std::cout << s1 << std::endl;
std::cout << s2 << std::endl;
std::cout << s << std::endl;
std::cout << s4 << std::endl;
printf("%d \n",s1.getlength());
printf("%d \n",s2.getlength());
std::cout << s.getlength() << std::endl;
std::cout << s3 << std::endl;
std::cout << s4 << "\n" << s5 << std::endl;
//型別轉換字串
const char *p = s1; //c++字串與c語言字串;
return 0;
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