What does template mean?

The template class starts with this code: template

template You can use it to define a template class or template function, where class is The right type represents a type.

class is regarded as the type name of the variable. The variable accepts the type as its value. Type is regarded as the name of the variable.

Put the template information in a header file and create stacktp.h

#ifndef STACKTP_H_
#define STACKTP_H_
// 建立模板
template<class Type>
class Stack
{
private:
    enum {MAX=10};
    Type items[MAX];
    int top;
public:
    Stack();
    bool isempty();
    bool isfull();
    bool push(const Type & item);
    bool pop(Type & item);
};
template<class Type>
Stack<Type>::Stack()
{
    top=10;
}
template<class Type>
bool Stack<Type>::isempty()
{
    return top==0;
}
template<class Type>
bool Stack<Type>::isfull()
{
    return top==MAX;
}
template<class Type>
bool Stack<Type>::push(const Type &item)
{
    if(top<MAX)
    {
        items[top++]=item;
        return true;
    }
    else
        return false;
}
template<class Type>
bool Stack<Type>::pop(Type & item)
{
    if(top>0)
    {
        item=items[--top];
        return true;
    }
    else
        return false;
}
#endif

Related recommendations: "FAQ"

Create the source file stacktem .cpp;

#include<iostream>
#include<string>
#include<cctype>
#include"stacktp.h"
using namespace std;
int main()
{
    Stack<string> st;// 创建一个空的stack,和前面的模板联系起来
    char ch;
    string po;
    cout<<"Please enter A to add a purchase order.\n"
        <<"P to precess a PO,or Q to quit."<<endl;
    while(cin>>ch && toupper(ch)!=&#39;Q&#39; )
    {
        while(cin.get()!=&#39;\n&#39;)
        {
            continue;
        }
        if(!isalpha(ch))
        {
            cout<<&#39;\a&#39;;
            continue;
        }
        switch(ch)
        {
        case &#39;A&#39;:
        case &#39;a&#39;:cout<<"Enter a PO number to add:"<<endl;
            cin>>po;
            if(st.isfull())
            {
                cout<<"stack already full"<<endl;
            }
            else
            {
                st.push(po);
            }
            break;
        case &#39;P&#39;:
        case &#39;p&#39;:
            if(st.isempty())
            {
                cout<<"stack already empty"<<endl;
            }
            else
            {
                st.pop(po);
                cout<<"PO #"<<po<<" popped\n";
                break;
            }
        }
        cout<<"Please enter A to add a purchase order,\n"
            <<"P to process a PO,or Q to quit.\n";
    }
    cout<<"Bye!"<<endl;
        return 0;
}

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