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1cout<<"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1cout<<"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：