5.new和delete

C++内存管理与大小

原创于 2017-04-02 00:42:01 发布 · 247 阅读

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本文通过C++代码示例介绍了如何使用new和delete进行内存分配与释放，并展示了不同数据类型所占内存大小及指针变量的大小。

 #include <iostream>
 int main(void){
    using namespace std;
    int night = 1001;
    int * pt = new int;
    *pt = 1001;
    cout<<"night value = "<<night<<" ; location "<<&night<<endl;
    cout<<"int "<<"value = "<<*pt<<" ; location "<<pt<<endl;
    double *pd = new double;
    *pd = 10001.0;
    cout<<"double value = "<<*pd<<" ; location "<<pd<<endl;
    cout<<"size of double = "<<sizeof(double)<<"; size of pd : "<<sizeof(pd)<<" size of *pf : "<<sizeof(*pd)<<endl;
    cout<<"size of int = "<<sizeof(int)<<"; size of pt : "<<sizeof(pt)<<"size of *pt : "<<sizeof(*pt)<<endl;
    delete pd;
    cout<<"delete pd"<<" pd is :"<<pd<<endl;
    delete pt;
    cout<<"delete pt"<<" pt is :"<<pt;
     return 0;
 }