每日一道C\C++笔试题V-内存泄露

每天一道C\C++笔试题V---内存泄露

俗语云：出来混，迟早是要还的。

下面是一道初级内存泄露题，程序员小懒儿显式的用new动态分配了内存，却忘记了用delete释放。

请找出问题的所在，代码如下：

#include <iostream>
#include <cstring>

using namespace std;

class Student
{
	int student_number;
	char* name;
public:
	Student(int,char*);		
};

Student::Student(int number,char* _name)
{
	student_number = number;
	name = new char[strlen(_name)+1];
	strcpy(name,_name);
	cout<<"student_number is "<<student_number<<endl;
	cout<<"name is "<<name<<endl;
}

int main()
{
	Student *student = new Student(123,"linc");	
	return 0;
}

用gcc编译运行：

D:\workspace\C++\memory_leak>gcc -o leak leak1.cpp -lstdc++
leak1.cpp: 在函数‘int main()’中:
leak1.cpp:29:43: 警告：不建议使用从字符串常量到‘char*’的转换 [-Wwrite-strings]


D:\workspace\C++\memory_leak>leak
student_number is 123
name is linc

虽然有编译器有警告，但是并不是提醒内存释放的问题。

其实上面的代码有两处没有释放内存，一个是Student的成员变量name没有在析构函数中释放掉；另一个是main函数中student用完要delete回收。

完整代码如下：

//linc
//2013.3.7
//C++ memory leak ,case 1

#include <iostream>
#include <cstring>

using namespace std;

class Student
{
	int student_number;
	char* name;
public:
	Student(int,char*);		
	virtual ~Student();
};

Student::Student(int number,char* _name)
{
	student_number = number;
	name = new char[strlen(_name)+1];
	strcpy(name,_name);
	cout<<"student_number is "<<student_number<<endl;
	cout<<"name is "<<name<<endl;
}

//here
Student::~Student()
{
	delete name;
}

int main()
{
	Student *student = new Student(123,"linc");
	delete student;	
	return 0;
}

每日一道C\C++笔试题V-内存泄露

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