Pointer array, array pointer, pointer function, function pointer

1. Array of pointers: As the name implies, arrays of pointers are pointers to the elements inside the array, and the code is as follows:

#include <stdio.h>intMainintargcConst Char*argv[]) {    //Insert code here ...//printf ("Hello, world!\n");    intA=1, b=2;//define two variables first    int*p[]={&a,&b};//the array is then defined, and the array elements are pointersprintf"%p\n"-P:0]); printf ("%p\n"-P:1]); return 0;}

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2. Array pointers: That is, the pointer points to the elements in the array, the code is as follows:

#include <stdio.h>intMainintargcConst Char*argv[]) {    //Insert code here ...//Array Pointers        intnums[]={1,2,3,4,5,6};//define an array//int *p=&nums[0];    int*p=nums;//This statement is equivalent to the preceding sentence, which defaults to the first address of the array, which is the address of the first element of the arrayprintf"%d\n",*p); printf ("%d\n", *p+1);//*p+1 can take the next element of the *p corresponding array elementprintf"--------\ n");  for(intI=0;i<sizeof(nums)/sizeof(int); i++)//use an array pointer to facilitate this array{printf ("%d\n", *p+i); }    return 0;}

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3. Pointer function: That is, the function's return value is the function of the pointer:

#include <stdio.h>//defines a function that returns the larger address of two numbersint*max (int*PA,int*PB)//define function, int * function name (parameter){    return*PA&GT;*PB? PA:PB;//returns the address of a large number}intMainintargcConst Char*argv[]) {    //Insert code here ...    intA=5, b=3; printf ("a=%p,b=%p\n", &a,&b);//print addresses for A and B    int*p=max (&AMP;A,&AMP;B);//incoming parameters are the addresses of A and B, respectivelyprintf"%p\n", p);//output larger number of addresses}

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//Enter lowercase numbers, output uppercase days of the week#include<stdio.h>Char*getday (intN//pointer Functions{    //defines an array of pointers to return addresses    Char*days[]=    {        "Monday",        "Tuesday",        "Wednesday",        "Thursday",        "Friday",        "Saturday",        "Sunday",    }; returndays[n-1];//return address}intMainintargcConst Char*argv[]) {    //Insert code here ...//printf ("Hello, world!\n");        Char*pday=getday (6);//defines the return value of a pointer receive functionprintf"%s\n", Pday);//Print out the contents of this pointer        return 0;}

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4. Function pointers: pointers to functions, which are function pointers

Definition method: Type (* function pointer name) (parameter) ....

Not to be continued

Pointer array, array pointer, pointer function, function pointer