C语言多重指针--整型字符字符串 int**pp

介绍

多重指针:一个指针指向另一个指针
离值越近的指针级别越大:一级
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内存布局

代码
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图示:
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多重指针–整型

#include<stdio.h>
#include<string.h>
//多重指针--整型//二级指针
void two()
{printf("二级指针:\n");int a=896;int *p=&a,**pp=&p;printf("a=%d self-address=%p\n",a,&a);printf("a=%d address=%p self-address=%p\n",*p,p,&p);printf("a=%d address=%p self-address=%p\n",**pp,pp,&pp);
}//三级指针
void three()
{printf("三级指针:\n");int a=57877777;int *p=&a,**pp=&p,***ppp=&pp;printf("a=%d self-address=%p\n",a,&a);printf("a=%d address=%p self-address=%p\n",*p,p,&p);printf("a=%d address=%p self-address=%p\n",**pp,pp,&pp);printf("a=%d address=%p self-address=%p\n",***ppp,ppp,&ppp);
}int main()
{two();three();getchar();return 0;
}

多重指针–字符

#include<stdio.h>
#include<string.h>
//多重指针--字符//二级指针
void two()
{printf("二级指针:\n");char a='i';char *p=&a,**pp=&p;printf("a=%c self-address=%p\n",a,&a);printf("a=%c address=%p self-address=%p\n",*p,p,&p);printf("a=%c address=%p self-address=%p\n",**pp,pp,&pp);
}//三级指针
void three()
{printf("三级指针:\n");char a='y';char *p=&a,**pp=&p,***ppp=&pp;printf("a=%c self-address=%p\n",a,&a);printf("a=%c address=%p self-address=%p\n",*p,p,&p);printf("a=%c address=%p self-address=%p\n",**pp,pp,&pp);printf("a=%c address=%p self-address=%p\n",***ppp,ppp,&ppp);
}int main()
{two();three();getchar();return 0;
}

多重指针–字符串

#include<stdio.h>
#include<string.h>
//多重指针--字符串//三级指针
void two()
{printf("三级指针:\n");char *a="hello world";char **p=&a,***pp=&p;printf("c=%c a=%s self-address=%p\n",*a,a,&a);//char **p=&a=a的地址  根本没有存储"hello world"的地址,不能使用 %s pprintf("a=%s address=%p self-address=%p\n",a,p,&p);printf("a=%s address=%p self-address=%p\n",a,pp,&pp);
}int main()
{two();getchar();return 0;
}