c++静态那些事

[cpp]
#include <QtCore/QCoreApplication>
#include <iostream>
#include <stdio.h>
using namespace std;

class A
{
public:
    A();
    static void GetStaticNum(); //静态函数

    void GetNum(); //普通函数

    void UseStatic();   //普通函数调用静态函数

    int j;    //普通变量成员
    static int i;   //静态成员变量
};

int A::i = 0;   //静态成员变量初始化

A::A()
{
    j=2;
}

void A::GetStaticNum()
{
    i++;
    cout<<"wyz=========GetStaticNum() i="<<i<<endl;
}

void A::GetNum()
{
    j++;
    cout<<"wyz=========GetNum() i="<<i<<endl;
    cout<<"wyz=========GetNum() j="<<j<<endl;
}

void A::UseStatic()
{
    static int k =0;    //静态变量
    k++;

    cout<<"wyz=========UseStatic() k="<<k<<endl;
    GetStaticNum();
}

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    A aa1;
    aa1.GetNum();

    A aa2;
    aa2.GetNum();

    A aaa1;
    aaa1.GetStaticNum();    //静态函数调用方法一

    A::GetStaticNum();          //静态函数调用方法二

    A *aa = new A();
    aa->GetNum();
    aa->UseStatic();
    aa->UseStatic();

    delete aa;

    return 0;

    return a.exec();
}

#include <QtCore/QCoreApplication>
#include <iostream>
#include <stdio.h>
using namespace std;

class A
{
public:
A();
static void GetStaticNum(); //静态函数

void GetNum(); //普通函数

void UseStatic(); //普通函数调用静态函数

int j; //普通变量成员
static int i; //静态成员变量
};

int A::i = 0; //静态成员变量初始化

A::A()
{
j=2;
}

void A::GetStaticNum()
{
i++;
cout<<"wyz=========GetStaticNum() i="<<i<<endl;
}

void A::GetNum()
{
    j++;
    cout<<"wyz=========GetNum() i="<<i<<endl;
    cout<<"wyz=========GetNum() j="<<j<<endl;
}

void A::UseStatic()
{
static int k =0; //静态变量
k++;

cout<<"wyz=========UseStatic() k="<<k<<endl;
GetStaticNum();
}

int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);

A aa1;
aa1.GetNum();

A aa2;
aa2.GetNum();

A aaa1;
aaa1.GetStaticNum(); //静态函数调用方法一

A::GetStaticNum(); //静态函数调用方法二

    A *aa = new A();
    aa->GetNum();
    aa->UseStatic();
    aa->UseStatic();

delete aa;

return 0;

return a.exec();
}

结果：

[cpp]
Starting /root/qtdir/StaticFunc-build-desktop/StaticFunc...
wyz=========GetNum() i=0
wyz=========GetNum() j=3
wyz=========GetNum() i=0
wyz=========GetNum() j=3
wyz=========GetStaticNum() i=1
wyz=========GetStaticNum() i=2
wyz=========GetNum() i=2
wyz=========GetNum() j=3
wyz=========UseStatic() k=1
wyz=========GetStaticNum() i=3
wyz=========UseStatic() k=2
wyz=========GetStaticNum() i=4
/root/qtdir/StaticFunc-build-desktop/StaticFunc exited with code 0

Starting /root/qtdir/StaticFunc-build-desktop/StaticFunc...
wyz=========GetNum() i=0
wyz=========GetNum() j=3
wyz=========GetNum() i=0
wyz=========GetNum() j=3
wyz=========GetStaticNum() i=1
wyz=========GetStaticNum() i=2
wyz=========GetNum() i=2
wyz=========GetNum() j=3
wyz=========UseStatic() k=1
wyz=========GetStaticNum() i=3
wyz=========UseStatic() k=2
wyz=========GetStaticNum() i=4
/root/qtdir/StaticFunc-build-desktop/StaticFunc exited with code 0
作者：wyz365889

补充：软件开发 , C++ ,