[C++知识库]C++指针

#include<stdio.h>
int main()
{
	int a;
	int *p;
	a = 10;
	p = &a;
	printf("%d\n",p);
	printf("%d\n",*p);
	printf("%d\n",&a);
}

6487572
10
6487572

#include<stdio.h>
int main()
{
	int a;
	int *p;
	a = 10;
	p = &a;
	printf("%d\n",a);
	*p = 12;
	printf("%d\n",a);
}

10
12

#include<stdio.h>
int main()
{
	int a;
	int *p;
	a = 10;
	p = &a;
	printf("%d\n",p);
	printf("%d\n",*p);
	int b = 20;
	*p = b;
	printf("%d\n",p);
	printf("%d\n",*p);
}

6487568
10
6487568
20

#include<stdio.h>
int main()
{
	int a;
	int *p;
	a = 10;
	p = &a;
	printf("%d\n",p);
	printf("%d\n",sizeof(int));
	printf("%d\n",p+1);
	printf("%d\n",*p);
}

6487572
4
6487576
10

#include<stdio.h>
int main()
{
	int a = 1025;
	int *p;
	p = &a;
	printf("%d\n",sizeof(int));
	printf("%d\n%d\n",p,*p);
	char *p0;
	p0 = (char*)p;
	printf("%d\n",sizeof(char));
	printf("%d\n%d\n",p0,*p0);
	printf("%d\n%d\n",p0+1,*(p0+1));
}

4
6487564
1025
1
6487564
1
6487565
4

#include<stdio.h>
int main()
{
	int x = 5;
	int *p = &x;
	*p = 6;
	int **q = &p;
	int ***r = &q;
	printf("%d\n",*p); 
	printf("%d\n",*q);
	printf("%d\n",*(*q));
	printf("%d\n",*(*r));
	printf("%d\n",*(*(*r)));
	***r = 10;
	printf("%d\n",x);
	**q = *p + 2;
	printf("%d\n",x);
}

6
6487572
6
6487572
6
10
12