c/c++多维数组动态分配与释放

- 日理万妓 2022-09-17 13:11 219阅读 0赞

# 如果对数组指针与指针数组不明白可以参看[http://blog.csdn.net/whzhaochao/article/details/12911785][http_blog.csdn.net_whzhaochao_article_details_12911785] #

# 1.一维 #

## 函数内部 ##

void main()
    {
    	int a[3]={1,2,3};
    	int *b;
    	b= new int[3];
    
    	b[0]=*a;
    	*(b+1)=a[1];
    	b[2]=*(a+2);
    
    	delete []b;
    
    }

![20131021164049296][] ![20131021164049296][]

## 函数外部 ##

void  newArray(int *&a,int *b){
    	a=new int[3];
    	a[0]=*b;
    	*(a+1)=b[1];
    	a[2]=*(b+2);
    }
    void deleteArray(int *&a){
    	delete []a;
    }
    
    void main(){
    
    		int a[3]={1,2,3};
    		int *b;
    		newArray(b,a);
    		deleteArray(b);
    }

![20131023101434140][]

# 2.二维 #

## 函数内部 ##

#include <stdio.h>
    
    void main()
    {
    	int a[][3]={
    		{1,2,3},
    		{4,5,6},
    		{7,8,9}
    	};
    
    	int (*p)[3]=new int[3][3];     //数据组指针
    	int *q[3];                     //指针数组
    
    	q[0]=a[0];
    	q[1]=a[1];
    	q[2]=a[2];
    
    //	p=a;
    	for (int i=0;i<3;i++)
    	{
    		for(int j=0;j<3;j++){
    			p[i][j]=a[i][j];
    		}
    	}
    
    	printf("\n%d ",sizeof(a));     //36
    	printf(" %d " ,sizeof(p));     //4
    	printf(" %d \n" ,sizeof(*p));  //12
    
    	delete []p;
    }

![20131021153944765][]  ![20131021154314703][]

## 函数外部 ##

void  newArray( int (*&p)[3],  int a[][3]){
    	p=new int[3][3];
    	for (int i=0;i<3;i++)
    	{
    		for(int j=0;j<3;j++){
    			p[i][j]=a[i][j];
    		}
    	}
    
    }
    void deleteArray( int (*&p)[3]){
    	delete []p;
    }
    
    void main()  
    {  
        int a[][3]={  
            {1,2,3},  
            {4,5,6},  
            {7,8,9}  
        };  
        int (*p)[3];
    	newArray(p,a);
    	deleteArray(p);
    
    
    }

![20131023104517890][]

# 3.三维 #

## 函数内部 ##

void main()
    {
    	int (*p)[3][2] =new int[4][3][2];
    	for (int i=0;i<4;i++)
    	{
    		for (int j=0;j<3;j++)
    		{
    			for(int k=0;k<2;k++){
    				p[i][j][k]=i+j+k;
    				printf(" %d ",i+j+k);
    			}
    			printf("\n");
    		}
    		printf("\n\n");
    	}
    	delete []p;	
    }

![20131021165419203][]

## 函数外部 ##

void  newArray( int (*&p)[3][2]){
    	p=new int[4][3][2];
    	for (int i=0;i<4;i++)
    	{
    		for (int j=0;j<3;j++)
    		{
    			for(int k=0;k<2;k++){
    				p[i][j][k]=i+j+k;
    				printf(" %d ",i+j+k);
    			}
    			printf("\n");
    		}
    		printf("\n\n");
    	}
    
    }
    void deleteArray( int (*&p)[3][2]){
    	delete []p;
    }
    
    void main()
    {
    	int (*p)[3][2] ;
    	newArray(p);
    	deleteArray(p);
    }

![20131023105046875][]

[http_blog.csdn.net_whzhaochao_article_details_12911785]: http://blog.csdn.net/whzhaochao/article/details/12911785
[20131021164049296]: /images/20220828/629dbad7609245f3943f5d0278275714.png
[20131023101434140]: /images/20220828/c9531618d6514e6aac95dda77fb308fa.png
[20131021153944765]: https://img-blog.csdn.net/20131021153944765
[20131021154314703]: /images/20220828/bc7f5426495146f9a4fb65b2b533b5ed.png
[20131023104517890]: /images/20220828/56f136cee4074fd19bfef4658dc584fb.png
[20131021165419203]: /images/20220828/81286bd2f2724300b6e35ad700d948e9.png
[20131023105046875]: /images/20220828/971216e17e7249e4ba8a563b862b3210.png