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#include
#include
class STR
{
  public:
  STR(char*x);
  STR();
  void disp();
  int getlength();
  void addchar(char a);
  private:
  char*contents;
  int length;
};//类的实现
STR::STR(char*x)
{
  length=strlen(x)+1;
  contents=new char[length];
  for(int i=0;i  contents[i]=x[i];
  }
void STR::disp()
{
 for(int i=0;icout<cout<}
STR::STR()
{
  length=0;
  contents=NULL;
}
int STR::getlength()
{
  return length;
}
void STR::addchar(char a)
{
  char *temp;
  temp=new char[length];
  strcpy(temp,contents);
  length++;
  delete contents;
  contents= new char[length];
  for(int i=0;i  contents[i]=temp[i];
  contents[length-2]=a;
  contents[length-1]='/n';
}//主函数
void main()
{
 STR string("hello");
 cout<<"The length of the sting hello is: "<  string.addchar('j');
  cout<<"After adding 'j' is: ";
  string.disp();
}




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