指针数组与指向指针的指针

指针数组与指向指针的指针

http://wlkc.gdqy.edu.cn/jpkc/portal/blob?key=173314

指针数组和数组指针的区别

http://allew.blog.163.com/blog/static/3374389720094148449239/

指针数组[组图]

http://school.cnd8.com/c/jiaocheng/9212.htm

函数指针和指针函数

http://lionwq.spaces.eepw.com.cn/articles/article/item/18258

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source 1

#include <stdio.h><br />int main(void)<br />{<br /> char *ptr[4] = {"beijing", "shanghai", "tianjin", "chongqing"};<br /> int i, *iptr[3], a[3]={1,2,3},b[3][2]={1,2,3,4,5,6};<br /> for(i=0; i<4; i++)<br /> printf("%s/t", ptr[i]);<br /> printf("/n");<br /> for(i=0; i<3; i++)<br /> iptr[i]=&a[i];<br /> for(i=0; i<3; i++)<br /> printf("%d/t", *iptr[i]);<br /> printf("/n");<br /> for(i=0; i<3; i++)<br /> iptr[i]=b[i];<br /> for(i=0; i<3; i++)<br /> printf("%d:%d/t", *iptr[i], *iptr[i]+1);<br /> printf("/n");<br /> return 0;<br />}<br /> 

result 1:

[work@db-testing-com06-vm3.db01.baidu.com c++]$ gcc -o array_ptr array_ptr.c 

[work@db-testing-com06-vm3.db01.baidu.com c++]$ ./array_ptr 

beijing shanghai        tianjin chongqing

1       2       3

1:2     3:4     5:6

========================

source 2

#include <stdio.h><br />#include <string.h><br />#include <stdlib.h><br />void show(char *ptr[], int);<br />void sort(char *ptr[], int);<br />int main(void)<br />{<br /> char *ptr[4], *tmp;<br /> int i;<br /> for(i=0; i<4; i++)<br /> {<br /> ptr[i] = (char *)malloc(20);<br /> fgets(ptr[i], 20, stdin);<br /> }<br /> show(ptr, 4);</p> <p> sort(ptr, 4);<br /> show(ptr, 4);</p> <p> return 0;<br />}<br />void show(char *ptr[], int num)<br />{<br /> int i;<br /> for(i=0; i<num; i++)<br /> printf("%10s", ptr[i]);</p> <p> printf("/n"); //换行<br />}<br />void sort(char *ptr[], int num)<br />{<br /> int i, j;<br /> char *tmp;</p> <p> for(i=0; i<num-1; i++)<br /> for(j=0; j<num-1-i; j++)<br /> {<br /> if(strcmp(ptr[j], ptr[j+1])>0)<br /> {<br /> tmp = ptr[j];<br /> ptr[j]=ptr[j+1];<br /> ptr[j+1]=tmp;<br /> }<br /> }<br />}<br /> 

result 2:

[work@db-testing-com06-vm3.db01.baidu.com c++]$ ./array_ptr_sort 

beijing

shanghai

tianjin

chongqing

  beijing

 shanghai

  tianjin

chongqing

  beijing

chongqing

 shanghai

  tianjin

=================================

指针函数

Source

#include <stdio.h><br />int main()<br />{<br /> char *ch(char *, char *);<br /> char str1[] = "I am glad to meet you";<br /> char str2[] = "Welcome to study C";<br /> printf("%s/n", ch(str1, str2));<br /> return 0;<br />}<br />char *ch(char *str1, char *str2)<br />{<br /> int i;<br /> char *p = str2; //指针赋值<br /> printf("str1: %s/nstr2: %s/n", str1, str2);</p> <p> return p; //返回指针<br />}<br /> 

Result

[work@db-testing-com06-vm3.db01.baidu.com c++]$ gcc -o func_pfun func_pfun.c 

[work@db-testing-com06-vm3.db01.baidu.com c++]$ ./func_pfun                  

str1: I am glad to meet you

str2: Welcome to study C

Welcome to study C

=================================

函数指针

Source

#include <stdio.h><br />int main()<br />{<br /> int max(int, int);<br /> int i, a, b, m;<br /> int (*f)(); //定义函数指针</p> <p> scanf("%d %d", &a, &b);<br /> f = max; //给函数指针f赋值，使它指向函数max<br /> m = (*f)(a, b); //通过函数指针f调用函数max<br /> printf("%d %d max: %d/n", a, b, m);<br /> return 0;<br />}<br />int max(int x, int y)<br />{<br /> return x>y ? x:y;<br />}<br /> 

Result

work@db-testing-com06-vm3.db01.baidu.com c++]$ gcc -o func_ptr func_ptr.c   

[work@db-testing-com06-vm3.db01.baidu.com c++]$ ./func_ptr 

3 6

3 6 max: 6