构造动态数组

#include <iostream>using namespace std;class Array{char *p;int len;public:Array(int n):len(0),p(NULL){resize(n);}void resize(int n){char* q = new char[n];int min = (n<len?n:len);if (p!=NULL){for (int i=0; i<min; i++){q[i] = p[i];delete[] p;}}p = q;for (int i=min; i<n; i++){p[i] = '\0';}len = n;}void set(int index, char value){if (index <0 || index >=len){cout << "越界" << endl;return;}p[index] = value;}char get(int index){if (index <0 || index >=len){cout << "越界" << endl;return '!';}return p[index];}int size(){return len;}~Array(){if (p!=NULL){delete[] p;p = NULL;}}};int main(){Array a1(100);cout << "input chars(end by '$'):";for (int i=0;; i++){char ch;cin >> ch;if (ch == '$')break;else if (i+1>a1.size()){a1.resize(i+10);}a1.set(i, ch);}for (int i=0; i<a1.size(); i++)cout << a1.get(i);cout << endl;return 0;}