有關(guān)于大自然的諺語(yǔ)260句
已知類(lèi)String的原型為：
class String
{
public:
String(const char *str = NULL); /pic/p>
String(const String &other); /pic/p>
~ String(void); /pic/p>
String & operate =(const String &other); /pic/p>
private:
char *m_data; /pic/p>
};
請(qǐng)編寫(xiě)String的上述4個(gè)函數(shù)。
標(biāo)準(zhǔn)答案：
/pic/p>
String::~String(void) /pic/p>
{
delete [] m_data;
/pic/p>
}
/pic/p>
String::String(const char *str) /pic/p>
{
if(str==NULL)
{
m_data = new char[1]; /pic/p>
*m_data = ‘\0’;
}
else
{
int length = strlen(str);
m_data = new char[length+1]; /pic/p>
strcpy(m_data, str);
}
}
/pic/p>
String::String(const String &other) /pic/p>
{
int length = strlen(other.m_data);
m_data = new char[length+1]; /pic/p>
strcpy(m_data, other.m_data);
}
/pic/p>
String & String::operate =(const String &other) /pic/p>
{
/pic/pic/p>
if(this == &other)
return *this;
/pic/pic/p>
delete [] m_data;
/pic/pic/p>
int length = strlen(other.m_data);
m_data = new char[length+1]; /pic/p>
strcpy(m_data, other.m_data);
/pic/pic/p>
return *this;
}
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