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ch21_3.cpp
Package: c.rar [view]
Upload User: puke2000
Upload Date: 2022-07-25
Package Size: 912k
Code Size: 1k
Category:
CSharp
Development Platform:
Visual C++
- //**********************
- //** ch21_3.cpp **
- //**********************
- #include <iostream.h>
- #include <string.h>
- class String{
- public:
- String(char*, int);
- class Range{ //异常类1
- public:
- Range(int j):index(j){}
- int index;
- };
- class Size{}; //异常类2
- char& operator[](int k)
- {
- if(0<=k && k<len)
- return p[k];
- throw Range(k);
- }
- private:
- char* p;
- int len;
- static int max;
- };
- int String::max = 20;
- String::String(char* str, int si)
- {
- if(si<0 || max<si)
- throw Size();
- p=new char[si];
- strncpy(p, str, si);
- len=si;
- }
- void g(String& str)
- {
- int num=10;
- for(int n=0; n<num; n++)
- cout <<str[n];
- cout <<endl;
- }
- void f()
- {
- //代码区1