[英]C++ Dynamic, Array Based Integer Stack
我刚刚开始学习C ++编程,为了锻炼,我找到了这个任务。 我必须编写一个基于数组的动态整数堆栈。 这就是我到目前为止所得到的。
#include <iostream>
using namespace std;
class DynamicIntegerStack
{
private:
int *bottom_;
int *top_;
int size_;
public:
DynamicIntegerStack(int n = 20){
bottom_ = new int[n];
top_ = bottom_;
size_ = n;
}
int getSize(){ return size_; }
void push(int c){
if (!full()){
*top_ = c;
top_++;
}
else{
resize(size_ * 2);
*top_ = c;
top_++;
}
}
void resize(int newSize){
//Allocate new array and copy in data
int *newArray = new int[newSize];
memcpy(newArray, bottom_, size_);
// Set the top to the new array
top_ = newArray + (top_ - bottom_);
// Delete old array
delete[] bottom_;
// Update pointers and size
bottom_ = newArray;
size_ = newSize;
cout << "array has been resized" << endl;
}
int num_items() {
return (top_ - bottom_);
}
char pop(){
top_--;
return *top_;
}
int full() {
return (num_items() >= size_);
}
int empty() {
return (num_items() <= 0);
}
void print(){
cout << "Stack currently holds " << num_items() << " items: ";
for (int *element = bottom_; element<top_; element++) {
cout << " " << *element;
}
cout << "\n";
}
~DynamicIntegerStack(){ // stacks when exiting functions
delete[] bottom_;
}
};
int main(){
DynamicIntegerStack s(5);
s.print(); cout << "\n";
s.push(1); s.push(3); s.push(5); s.push(10); s.push(15);
s.print(); cout << "\n";
s.push(20);
s.print(); cout << "\n";
cout << "Popped value is: " << s.pop() << "\n";
s.print(); cout << "\n";
s.push(30);
s.print(); cout << "\n";
s.pop();
s.pop();
s.print(); cout << "\n";
while (!s.empty()) s.pop();
if (s.num_items() != 0) {
cout << "Error: Stack is corrupt!\n";
}
s.print(); cout << "\n";
// destructor for s automatically called
system("pause"); // execute M$-DOS' pause command
return 0;
}
直到阵列已满并且我调整其大小之前,它都可以正常工作。 之后,它开始打印而不是整数。
在此先感谢您的帮助。
使用memcpy
,要复制的内存大小必须以字节为单位。
因此,您必须将sizeof(int)
乘以n
。
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