003_linuxC++之_namespace使用
标签：linu \n tag info person col lis cpp glob
（一）引入namespace原因：
假如有很多跟人共同完成一项工程，工程中难免会有函数定义一样的名称，不可能一个一个的询问这个函数 你定义过了没有，所以引入namespace
1 #include 2 #include "person.h"
3 #include "dog.h"
4
5 /*global namespace*/
6 /*把A::person放入global namespace，以后可以使用person来表示A::person*/
7 using namespace A;
8 using namespace C;
9
10
11 int main(int argc,char ** argv)
12 {
13 /*local namespace*/
14 Person per;
15 Dog dog;
16 per.setName("zhangsan");
17 per.setAge(10);
18 per.printInfo();
19
20 dog.setName("lisi");
21 dog.setAge(20);
22 dog.printInfo();
23
24 A::printVersion();
25 C::printVersion();
26 return 0;
27 }
main.cpp
1 #include 2 namespace A{
3
4 class Person{
5 private:
6 char *name;
7 int age;
8 char *work;
9
10 public:
11 void setName(char *name);
12 int setAge(int Age);
13 void printInfo(void);
14 };
15
16 void printVersion(void);
17 }
person.h
1 #include 2 #include "person.h"
3 using namespace std;
4
5 namespace A{
6 void Person::setName(char *name)
7 {
8 this->name = name;
9 }
10 int Person::setAge(int Age)
11 {
12 if(Age 0 || Age > 150)
13 {
14 this->age = 0;
15 return -1;
16 }
17 this->age = Age;
18 return 0;
19 }
20 void Person::printInfo(void)
21 {
22 cout"nane = ""age = ""work = "endl;
23 //intf("name = %s, age = %d, work = %s\n",name,age,work);
24 }
25
26 void printVersion(void)
27 {
28 cout"Person V1, by luxiaoguo"endl;
29 //intf("Person V1, by luxiaoguo\n");
30 }
31
32
33 }
person.cpp
1 namespace C{
2
3 class Dog{
4 private:
5 char *name;
6 int age;
7 char *work;
8
9 public:
10 void setName(char *name);
11 int setAge(int age);
12 void printInfo(void);
13 };
14
15 void printVersion(void);
16
17 }
dog.h
1 #include 2 #include "dog.h"
3
4 namespace C{
5
6 void Dog::setName(char *name)
7 {
8 this->name = name;
9 }
10 int Dog::setAge(int Age)
11 {
12 if(Age 0 || Age > 150)
13 {
14 this->age = 0;
15 return -1;
16 }
17 this->age = Age;
18 return 0;
19 }
20 void Dog::printInfo(void)
21 {
22 printf("name = %s, age = %d, work = %s\n",name,age,work);
23 }
24
25 void printVersion(void)
26 {
27 printf("Dog V1, by luxiaoguo\n");
28 }
29 }
dog.cpp
003_linuxC++之_namespace使用
标签：linu \n tag info person col lis cpp glob
原文地址：https://www.cnblogs.com/luxiaoguogege/p/9690146.html
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