Wisdom Podcast c/c++--Note one

Teacher: Wang Paoming

1. Interface encapsulation and design idea guidance and preliminary practice

API Package Design:

Four-zone memory diagram:

Four District Introduction:

When writing a header file:

Avoid repeating multiple header files in. c

#ifndef _clt_socket2_h__

#define _clt_socket2_h__

...//second time not defined

#endif

As below:

#include "Cltsocket.h"

#include "Cltsocket.h"

#include "Cltsocket.h"

There is no error.

Warned:

1. Project/Code space management, numbering, easy to manage, view.

2. As a developer, file viewing methods are detailed and easy to find quickly.

Features of C + + learning:

Java Learning, Application, Project

C Learn, understand, apply and do projects

2. Sort warm-up and array function parameters degenerate to pointer extension

Bubble Sort Core code:

1 PrintfArray3 (a);2 3      for(i=0; i<Ten; i++)4     {5          for(j=i+1;j<Ten; J + +)6         {7             if(A[i] <A[j])8             {9TMP =A[i];TenA[i] =A[j]; OneA[J] =tmp; A             } -         } -}

Conclusion

1 arrays do function parameters and degenerate into pointers

2 Char buf[30],int a[10], which appears in the parameter , is used as a pointer and does not actively allocate memory,C, C + + the compiler will automatically optimize: degenerate to pointer

int i = 0;

int num1 = sizeof (a); The formal parameter is a[10]:sizeof (a) = = sizeof (int *) is equivalent to a pointer, only 4 bytes

int num2 = sizeof (*A);

int num = sizeof (a)/sizeof (*a); num = 1, not the length of the array

int num1 = sizeof (a); data types are different

3 sizeof (a) the difference in size is that the data type of a is different because the array function parameter is degraded to the pointer

vs Notes:

Shift+del Delete a row

Ctlr+u make words from small to upper case

Shift+ctrl+u from size to lowercase

Wisdom Podcast c/c++--Note one