1+ #include < cstring>
2+ #include < cstdlib>
3+ #include < string>
4+ #include < iostream>
5+ using namespace std ;
6+ 7+ // 在此处补充你的代码
8+ class MyString : public string
9+ {
10+ public:
11+ MyString () :string() {}
12+ MyString (char *str) :string(str) {}
13+ MyString (string str) :string(str) {}
14+ MyString (MyString &mystr) :string(mystr) {}
15+ MyString operator ()(int start, int length)
16+ {
17+ return this ->substr (start, length);
18+ }
19+ };
20+ 21+ int CompareString (const void * e1 , const void * e2 )
22+ {
23+ MyString * s1 = (MyString *)e1 ;
24+ MyString * s2 = (MyString *)e2 ;
25+ if (*s1 < *s2)
26+ return -1 ;
27+ else if (*s1 == *s2)
28+ return 0 ;
29+ else if (*s1 > *s2)
30+ return 1 ;
31+ }
32+ 33+ int main ()
34+ {
35+ MyString s1 (" abcd-" s3 (" efgh-" s4 (s1);
36+ MyString SArray[4 ] = { " big" " me" " about" " take"
37+ cout << " 1. "
38+ s4 = s3;
39+ s3 = s1 + s3;
40+ cout << " 2. "
41+ cout << " 3. "
42+ cout << " 4. "
43+ cout << " 5. "
44+ cout << " 6. " 2 ] << endl;
45+ s2 = s1;
46+ s1 = " ijkl-"
47+ s1[2 ] = ' A'
48+ cout << " 7. "
49+ cout << " 8. "
50+ s1 += " mnop"
51+ cout << " 9. "
52+ s4 = " qrst-"
53+ cout << " 10. "
54+ s1 = s2 + s4 + " uvw " " xyz"
55+ cout << " 11. "
56+ qsort (SArray, 4 , sizeof (MyString), CompareString);
57+ for (int i = 0 ; i < 4 ; i++)
58+ cout << SArray[i] << endl;
59+ // s1的从下标0开始长度为4的子串
60+ cout << s1 (0 , 4 ) << endl;
61+ // s1的从下标5开始长度为10的子串
62+ cout << s1 (5 , 10 ) << endl;
63+ return 0 ;
64+ }
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