下面这段程序大家看看有什么问题啊，小弟搞不定了。。
#include "stdio.h"
#include "string.h"
char swap(char *p1[20],char *p2[20])
{
    char *p[20];
    strcpy(p,p1);
    strcpy(p1,p2);
    strcpy(p2,p);
}
void main()
{
    char *str1[20],*str2[20],*str3[20];
    char swap();
    printf("Input three lines:\n");
    gets(str1);
    gets(str2);
    gets(str3);
    if(strcmp(str1,str2)>0) swap(str1,str2);
    if(strcmp(str1,str3)>0) swap(str1,str3);
    if(strcmp(str2,str3)>0) swap(str2,str3);
    printf("Now the order is:\n");
    printf("%s\n%s\n%s\n",str1,str2,str3);
}
下面是详细的错误信息：
e:\program files\microsoft visual studio\myprojects\1040\1040.cpp(6) : error C2664: 'strcpy' : cannot convert parameter 1 from 'char *[20]' to 'char *'
        Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
e:\program files\microsoft visual studio\myprojects\1040\1040.cpp(7) : error C2664: 'strcpy' : cannot convert parameter 1 from 'char *[]' to 'char *'
        Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
e:\program files\microsoft visual studio\myprojects\1040\1040.cpp(8) : error C2664: 'strcpy' : cannot convert parameter 1 from 'char *[]' to 'char *'
        Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
e:\program files\microsoft visual studio\myprojects\1040\1040.cpp(15) : error C2664: 'gets' : cannot convert parameter 1 from 'char *[20]' to 'char *'
        Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
e:\program files\microsoft visual studio\myprojects\1040\1040.cpp(16) : error C2664: 'gets' : cannot convert parameter 1 from 'char *[20]' to 'char *'
        Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
e:\program files\microsoft visual studio\myprojects\1040\1040.cpp(17) : error C2664: 'gets' : cannot convert parameter 1 from 'char *[20]' to 'char *'
        Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
e:\program files\microsoft visual studio\myprojects\1040\1040.cpp(18) : error C2664: 'strcmp' : cannot convert parameter 1 from 'char *[20]' to 'const char *'
        Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
e:\program files\microsoft visual studio\myprojects\1040\1040.cpp(18) : error C2660: 'swap' : function does not take 2 parameters
e:\program files\microsoft visual studio\myprojects\1040\1040.cpp(19) : error C2664: 'strcmp' : cannot convert parameter 1 from 'char *[20]' to 'const char *'
        Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
e:\program files\microsoft visual studio\myprojects\1040\1040.cpp(19) : error C2660: 'swap' : function does not take 2 parameters
e:\program files\microsoft visual studio\myprojects\1040\1040.cpp(20) : error C2664: 'strcmp' : cannot convert parameter 1 from 'char *[20]' to 'const char *'
        Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
e:\program files\microsoft visual studio\myprojects\1040\1040.cpp(20) : error C2660: 'swap' : function does not take 2 parameters
执行 cl.exe 时出错.
谢谢。

多谢啊。但是我最近在练习指针的用法，用指针这个程序该怎么改呢

额。char p1[],p2[];这是定义的字符数组，不是指针啊。char *p1[],*p2[]；才是定义的指针数组啊。高手指点

非常感谢啊，这么编问题就解决了。也谢谢楼上其他各位啊