c++申请堆内存

int *p = NULL;

if(NULL == p)

{

// 申请内存空间

        p = new int;

}

*p = 20;

cout << *p << endl;

释放内存空间

delete p;

 

c申请堆内存

int *p = NULL;

if(NULL == p)

{

    p = (int*)malloc(sizeof(int));

}

*p = 20;

printf("*p = %d\n", *p);

free(p);

new申请的一定要手动delete释放

int* p = new int;

*p = 100;

delete p;