指针一些代码，个人学习记录

#include<stdio.h>
int main()
{
char *cBooks[]={
“Ccxu”,
“czhuanjia”,
“cyuzhizheng”,
“cxianjing”,
“cprinmer”,
“daidaidaidai”};
char **by;
char **jia[4];
by=&cBooks[5];
jia[0]=&cBooks[0];
jia[1]=&cBooks[1];
jia[2]=&cBooks[2];
jia[3]=&cBooks[3];
printf(“c:%s\n”,*by);
printf(“jia:\n”);
int i;
for(i=0;i<4;i++)
{
printf("%s\n",*jia[i]);
}

return 0;

}

#include<stdio.h>
int main()
{
//pi不可修改
const float pi=3.14;
printf("%f\n",pi);
int num=520;
const int cnum=880;
const int *pc=&cnum;
printf(“cnum %d,&cnum %p\n”,cnum,&cnum);
printf("*pc=%d,pc &p\n",*pc,pc);
pc=#
printf(“num %d,&num %p\n”,num,&num);
printf("*pc=%d,pc &p\n",*pc,pc);
num=1024;
printf(“cnum %d,&cnum %p\n”,cnum,&cnum);
printf("*pc=%d,pc &p\n",*pc,pc);

return 0;

}

#include<stdio.h>
int main()
{
int num=520;
const int cnum=880;
const int *const p=&cnum;
*p=1024;//会报错，*p只读不可修改
printf("*p:%d\n",*p);
p=&cnum;//会报错，p只读不可修改
printf("*p:%d\n",*p);

return 0;

}

#include<stdio.h>
int main()
{
int num=520;
const int cnum=880;
/*
const int *const p=&cnum;
*p=1024;//会报错，*p只读不可修改
printf("*p:%d\n",*p);
p=&cnum;//会报错，p只读不可修改
printf("*p:%d\n",*p);
*/
const int *const p=#
num=1024;
printf("*p:%d\n",*p);
return 0;
}

#include<stdio.h>
int main()
{
int num=520;
const int cnum=880;

const int *const p=#
const int *const *pp=&p;

printf("pp %p,&p %p\n\n",pp,&p);
printf("*pp %p,p %p,&num %p\n",*pp,p,&num);
printf("**pp %d,*p %d,num %d\n",**pp,*p,num);
return 0;

}