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a.       ´æ´¢·½Ê½£º±»´æ´¢ÔÚÒ»¸ö×Ö·ûÊý×éÖУ¬Í¨¹ýÒ»¸öchar*ÀàÐ͵ÄÖ¸ÕëÀ´²Ù×ÝËü¡£
b.       ÌṩµÄ¿âº¯Êý£º°üº¬Í·Îļþ£º#include<cstring>
a)         int strlen( const char* );//·µ»Ø×Ö·û´®µÄ³¤¶È
b)        int strcmp( const char*, const char* );//±È½ÏÁ½¸ö×Ö·û´®ÊÇ·ñÏàµÈ
c)        char* strcpy( char*, const char* );//°ÑµÚ¶þ¸ö×Ö·û´®¿½±´µ½µÚÒ»¸ö×Ö·û´®ÖÐ
#include <iostream>
#include <cstring>
#include <stdio.h>
using namespace std;
void main()
{
    char* arraya = "hello world!";
    int c;
    c = strlen(arraya);
    cout<<c<<endl;
    char arrayb[80];
    char * test = NULL;
    test = strcpy (arrayb, arraya);
    cout<<"test is: "<<test<<endl;
    cout<<arrayb<<endl;
    int d;
    d = strcmp(arrayb,arraya);
    cout<<endl<<"d->"<<d<<endl;
}Õâ¶Î´úÂë°üº¬ÁËÒÔÉÏÈý¸ö¿âº¯ÊýµÄʹÓá£
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ÕâÀïÎÒÃǶ¨ÒåÒ»¸östring£ºstring sa = “hello world!”;
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