参数作用域实践

auto参数，申明时可以忽略auto

void fun(){

     int p = 1;

    cout<<"p:"<<p<<endl;

    for(int i=0;i<=5;i++){
        int p =10;
        cout<<"p:"<<p<<endl;
    }

    // 此处输出的还是外围作用域定义的p值1
    cout<<"p:"<<p<<endl;
}

输出如下：

#include <iostream>

using namespace std;

//============================================================================
//总结：
//============================================================================

void autoParam(){

     int p = 1;

    cout<<"p:"<<p<<endl;

    for(int i=0;i<=5;i++){
        int p =10;
        cout<<"p:"<<p<<endl;
    }

    // 此处输出的还是外围作用域定义的p值1
    cout<<"p:"<<p<<endl;
}

static int aa = 100;
int staticParam(int x){

    static int n = 0;
    n += x;
    return n;
}


int main(){

    cout << "函数参数作用域实践：" << endl;

    autoParam();

    int sum = 0;
    for(int j = 0; j<=10;j++){
        sum = staticParam(j);
        cout<<"sum:"<<sum<<endl;
    }

    cout<<"aa:"<<aa<<endl;

    cout << "end." << endl;
    return 0;
}

输出结果如下：