A:全面的MyString
描述
程序填空，输出指定结果
#include <cstdlib> #include <iostream> using namespace std; int strlen(const char * s) { int i = 0; for(; s[i]; ++i); return i; } void strcpy(char * d,const char * s) { int i = 0; for( i = 0; s[i]; ++i) d[i] = s[i]; d[i] = 0; } int strcmp(const char * s1,const char * s2) { for(int i = 0; s1[i] && s2[i] ; ++i) { if( s1[i] < s2[i] ) return -1; else if( s1[i] > s2[i]) return 1; } return 0; } void strcat(char * d,const char * s) { int len = strlen(d); strcpy(d+len,s); } class MyString { // 在此处补充你的代码 }; int CompareString( const void * e1, const void * e2) { MyString * s1 = (MyString * ) e1; MyString * s2 = (MyString * ) e2; if( * s1 < *s2 ) return -1; else if( *s1 == *s2) return 0; else if( *s1 > *s2 ) return 1; } int main() { MyString s1("abcd-"),s2,s3("efgh-"),s4(s1); MyString SArray[4] = {"big","me","about","take"}; cout << "1. " << s1 << s2 << s3<< s4<< endl; s4 = s3; s3 = s1 + s3; cout << "2. " << s1 << endl; cout << "3. " << s2 << endl; cout << "4. " << s3 << endl; cout << "5. " << s4 << endl; cout << "6. " << s1[2] << endl; s2 = s1; s1 = "ijkl-"; s1[2] = 'A' ; cout << "7. " << s2 << endl; cout << "8. " << s1 << endl; s1 += "mnop"; cout << "9. " << s1 << endl; s4 = "qrst-" + s2; cout << "10. " << s4 << endl; s1 = s2 + s4 + " uvw " + "xyz"; cout << "11. " << s1 << endl; qsort(SArray,4,sizeof(MyString),CompareString); for( int i = 0;i < 4;i ++ ) cout << SArray[i] << endl; //s1的从下标0开始长度为4的子串 cout << s1(0,4) << endl; //s1的从下标5开始长度为10的子串 cout << s1(5,10) << endl; return 0; }
输入
无
输出
1. abcd-efgh-abcd-
2. abcd-
3.
4. abcd-efgh-
5. efgh-
6. c
7. abcd-
8. ijAl-
9. ijAl-mnop
10. qrst-abcd-
11. abcd-qrst-abcd- uvw xyz
about
big
me
take
abcd
qrst-abcd-样例输入
无
样例输出
1. abcd-efgh-abcd-
2. abcd-
3.
4. abcd-efgh-
5. efgh-
6. c
7. abcd-
8. ijAl-
9. ijAl-mnop
10. qrst-abcd-
11. abcd-qrst-abcd- uvw xyz
about
big
me
take
abcd
qrst-abcd-
来源Guo Wei
1 char *p; 2 public: 3 //构造函数 4 MyString(const char *a){ 5 //if(p)delete[]p; 6 p=new char[strlen(a)+1]; 7 strcpy(p,a); 8 } 9 MyString(){ 10 p=new char[1]; 11 p[0]='\0'; 12 } 13 //copy 14 MyString(const MyString&s){ 15 p=new char[strlen(s.p)+1]; 16 strcpy(p,s.p); 17 } 18 //destruct 19 ~MyString(){if(p)delete[]p;} 20 //cout 21 friend ostream&operator<<(ostream&os,MyString &a){ 22 os<<a.p; 23 return os; 24 } 25 //class+class 26 friend MyString operator+(const MyString &a,const MyString &b){ 27 char *res=new char[strlen(b.p)+strlen(a.p)+1]; 28 strcpy(res,a.p); 29 strcat(res,b.p); 30 return MyString(res); 31 } 32 //[] 33 char&operator[](int x){ 34 return p[x]; 35 } 36 //class=class 37 MyString& operator=(const MyString&a){ 38 if(p)delete[]p; 39 p=new char[strlen(a.p)+1]; 40 strcpy(p,a.p); 41 return *this; 42 } 43 //class=char 44 MyString& operator=(char *s){ 45 if(p)delete[]p; 46 p=new char[strlen(s)+1]; 47 strcpy(p,s); 48 return *this; 49 } 50 //class+=char 51 MyString operator +=(const char *s){ 52 *this=*this+MyString(s); 53 return *this; 54 } 55 //char+class 56 friend MyString operator +(char *s,MyString&a){ 57 return MyString(s)+a; 58 } 59 //class+char 60 MyString operator +(char*s){ 61 return *this+MyString(s); 62 } 63 //< 64 friend bool operator<(MyString&a,MyString&b){ 65 return (strcmp(a.p,b.p)==-1); 66 } 67 //> 68 friend bool operator>(MyString&a,MyString&b){ 69 return (strcmp(a.p,b.p)==1); 70 } 71 //= 72 friend bool operator==(MyString&a,MyString&b){ 73 return (strcmp(a.p,b.p)==0); 74 } 75 //() 76 char*operator()(int x,int y){ 77 char *ptr=new char[y+1]; 78 for(int i=0;i<y;i++){ 79 ptr[i]=p[i+x]; 80 } 81 ptr[y]='\0'; 82 return ptr; 83 }