#include
#include
using namespace std;
class myString
{
public:
myString(const char*pn=0);
myString(const myString &other);
~myString();
void set(const char *pn=0);
void print();
char get(int i);
void toUpper();
bool strcompare(const myString&s);
private:
char *pStr;
int size;
};
myString::myString(const char*pn)
{}
myString::myString(const myString &other)
{
size=other.size;
if(other.pStr)
{
pStr=new char[strlen(other.pStr)+1];
strcpy(pStr,other.pStr);
}
else
{
pStr=new char[8];
strcpy(pStr,"no name");
}
}
myString::~myString()
{
delete[]pStr;
}
void myString::set(const char*pn)
{
strcpy(pStr,pn);
}
void myString::print()
{
size=strlen(pStr);
for(int i=0;i<10;i++)
{
cout<<pStr[i]<<" "<<endl;;
}
cout<<size<<endl;
}
char myString::get(int i)
{
if(i<=size)
return pStr[i];
else
return 0;
}
void myString::toUpper()
{
}
bool myString::strcompare(const myString& s)
{
int m=strlen(s.pStr);
if(size=m) return true;
else return false;
}
int main()
{
myString s2,s1("Hello");
cout<<s1.get(0)<<endl;
s2.print();
s2.set("Hello world");
s2.print();
s1.toUpper();
s1.print();
myString s3=s2;
if(s2.strcompare(s3)) cout<<"字符串相同";
else cout<<"字符串不同";
return 0;
}
myString的构造函数myString(const char*pn)里没有赋值，
myString(const myString &other)里的pStr new需要在myString(const char*pn)里做同样的处理，
你写的s2，s1都是执行的myString(const char*pn)构造。
构造函数并没有对pStr进行任何操作，也就是说myString s2,s1("Hello");执行之后s2,s1均指向随机的值