c How do I create objects dynamically? C Why do you want to create objects dynamically

Dynamically create controls:

for (int i = 0; i < 10; i++)string strname = "textb" +

textbox tt = new textbox();

strname;

new point(i*20,i*20+100);The location of the control.

Invoke the created control:"textb1"].text = "click";

textbox txtnewtext = new textbox();

If it's a winfrom, mark it with the name attribute.

textbox"+;

with point(x,y); to locate.

If it's web, mark it with the id attribute.

textbox"+;

This is the content of the display text box.

textbox"+;

First, it can save resources to the greatest extent

For example, a program that can handle a lot of things, 1, can handle all the students in a school of 50,000 people.

2. It can handle a small class of dozens of people.

1) If you use static allocations, for example, arrays. When you know you need to deal with these problems, you need to define an array of 50,000 lengths to solve the problem. At this time, use this program to process the class data.

The large number of memory addresses allocated here is wasteful.

2) To deal with the data of schools with more than 50,000 students, there will be a problem of insufficient allocation. Re-revision** is required. This is called overflow in C++.

3) Benefits of using dynamic allocation of memory. If it's dynamic, it's about using as much as you want. Memory is allocated based on the size of the data entered.

For example, if the program handles a small class of 50 people, 50 spaces will be allocated. When you add another person, the program automatically adds another space to the back.

Second, the advantages are as follows:

1. It will not cause waste, basically how much is used.

2. It can be increased and decreased at any time.

The program is more flexible. There will also be no problem of underallocation.

For example, when a program is running, it needs to create several objects of class A according to user needs, how do you write it? a a,b,c...Statically creating objects doesn't work.

At this point, it's time to create it dynamically.

Dynamic memory development is flexible, and dynamic objects are good for special data structures.

The benefits are certainly many!! LS is talking about a and, most importantly, the ability to allocate memory on demand.

Improve the utilization of system resources.

Allocate as much as you need.

Allocated in one go, there will be a lot of useless memory usage.