作用域解析运算符与 this 指针

2024年8月28日 | 阅读 4 分钟

作用域解析运算符和 'this' 指针对于在软件开发敏捷生命周期方法中实现有效的 C++ 程序和设计面向对象过程至关重要。作用域解析运算符帮助开发人员访问类成员或静态实体。另一方面，'this' 指针帮助我们处理具有相同名称的局部对象成员变量。

C++ 代码

// Here we are writing down the C++ programming language code to demonstrate
// the concept of Scope Resolution Operator vs this pointer in C++
// where the code shows the parameters which are local and hides the 
// class members inside it!
#include <iostream>
using namespace std;

// the below code snippet helps us with creating the test class  
class Test {
	int a;

public:
	Test() { a = 1; }

	// here, the parameter 'a', which is local in nature, helps us with
	// hiding the member class 'a'!
	void func(int a) { cout << a; }
};

// The main driver code functionality starts from here. It helps us to 
// implement the concept Scope Resolution Operator vs this pointer in C++
int main()
{
    // this is the sample test object which we have implemented from class
	Test obj;
	int k = 3;
	obj.func(k);
	return 0;
	// end of the main driver code functionality
}

输出

C++ 代码

// Here we are writing down the C++ programming language code to demonstrate
// the concept of Scope Resolution Operator vs this pointer in C++
// where the code shows the parameters which are local and hides the 
// class members inside it!
#include <iostream>
using namespace std;
// the below code snippet helps us with creating the test class  
class Test {
	int a;

public:
	Test() { a = 1; }

	// here, the parameter 'a', which is local in nature, helps us with
	// hiding the member class 'a'!

	void func(int a) { cout << this->a; }
};

// The main driver code functionality starts from here. It helps us to 
// implement the concept Scope Resolution Operator vs this pointer in C++
int main()
{
    // this is the sample test object which we have implemented from class
	Test obj;
	int k = 3;
	obj.func(k);
	return 0;
	// end of the main driver code functionality
}

输出

C++ 代码

// Here we are writing down the C++ programming language code to demonstrate
// the concept of Scope Resolution Operator vs this pointer in C++
// where the code shows the parameters which are local and hides the 
// class members inside it! Also, show the local variables' access with 
// the same name

#include <iostream>
using namespace std;
// the below code snippet helps us with creating the test class  
class Test {
	static int a;

public:
	// here, the parameter 'a', which is local in nature, helps us with
	// hiding the member class 'a'! but it can be accessed using '::.''
	void func(int a) { cout << Test::a; }
};

// In C++ programming language, the static members must be explicitly 
// defined
// like the format given below!

int Test::a = 1;

// The main driver code functionality starts from here. It helps us to 
// implement the concept Scope Resolution Operator vs this pointer in C++
int main()
{
    // this is the sample test object which we have implemented from class
	Test obj;
	int k = 3;
	obj.func(k);
	return 0;
	// end of the main driver code functionality
}

输出

C++ 代码

// Here we are writing down the C++ programming language code to demonstrate
// the concept of Scope Resolution Operator vs this pointer in C++
// where the code shows the parameters which are local and hides the 
// class members inside it!
#include<iostream>
using namespace std;
// the below code snippet helps us with creating the AB class
class AB {
   int x;
   public:
      AB() {
         x = 6;
      }
// here, the parameter 'x', which is local in nature, helps us with
	// hiding the member class 'x'!

   void print(int x) {
      cout<<"Hey! coder the number required is: " << this->x;
   }
};
// The main driver code functionality starts from here. It helps us to 
// implement the concept Scope Resolution Operator vs this pointer in C++

int main() {
    // this is the sample AB object which we have implemented from class
   AB ob;
   int m = 7 ;
   ob.print(m);
   return 0;
   // end of the main driver code functionality
}

输出

Hey! Coder, the number required is: 6

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