C Exercise Example 77
Title:Practice pointer-to-pointer (using multi-level pointers to traverse a string array).
Program analysis:None.
Program source code:
Example
// Created by www.example.com on 15/11/9.
// Copyright © 2015 Example. All rights reserved.
#include <stdio.h>
#include <stdlib.h>
int main() {
// define an array of character pointers to store string constants
const char *s[] = {"man", "woman", "girl", "boy", "sister"};
// define a pointer variable that points to a character pointer
const char **q;
int k;
// traverse the array and output each string through a pointer to pointer
for (k = 0; k < 5; k++) {
q = &s[k]; // make pointer q point to the address of the kth element in the character pointer array
printf("%s\n", *q); // dereference q to output the corresponding string
}
return 0;
}
Code explanation:
pointer to pointer exercise：
qis defined asconst char **type, it is a pointer toconst char *pointer. By passing theqassign to&s[k]，qpoints to an array of character pointerssin thekaddress of the element.q = &s[k]role of：s[k]is the ...th in the character pointer arraykelement,&s[k]represents thekaddress of the element. Therefore,qIt ultimately points to an element in an array of character pointers.printf("%s\n", *q)role of：*qdereferenceq, i.e., obtains[k]Then print out the content of the string it points to.
The output of the above example is:
man woman girl boy sisterother extensions