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扩展String类，引入头文件CString.h，它的内容如下：

#include 
   
    using namespace std;class String {protected:    char *mystr;    int len;public:    String(const char *p) {        len = strlen(p);        mystr = new char[len + 1];        strcpy(mystr, p);    }    ~String() {        if (mystr != NULL) {            delete[] mystr;            mystr = NULL;            len = 0;        }    }    void showStr() {        cout << mystr << endl;    }};
   

实现int IsSubString(int start, const char *str)：

int EditString::IsSubString(int start, const char *str) {    int i, j;    for (i = 0; i < len; i++) {        int k = start + i;        for (j = 0; str[j] != '\0'; j++, k++) {            if (str[j] != mystr[k]) break;        }        if (str[j] == '\0') return start + i;    }    return -1;}

实现void EditChar(char s, char d)：

void EditString::EditChar(char s, char d) {    int i = 0;    while (mystr[i]) {        if (mystr[i] == s) {            mystr[i] = d;        }        i++;    }}

实现void EditSub(char * subs, char * subd)：

void EditString::EditSub(const char *subs, const char *subd) {    int i, j, len_s = strlen(subs), len_d = strlen(subd);    for (i = 0; i < len; i++) {        int k = i;        for (j = 0; subs[j] != '\0'; j++, k++) {            if (subs[j] != mystr[k]) break;        }        if (subs[j] == '\0') {            int m = i + len_s;            while (mystr[m - 1]) {                mystr[m + len_d - len_s] = mystr[m];                m++;            }            m = 0;            while (subd[m]) {                mystr[i + m] = subd[m];                m++;            }            i += (len_d - 1);        }    }}

实现void DeleteChar(char ch)：

void EditString::DeleteChar(char ch) {    int i = 0;    while (mystr[i]) {        while (mystr[i] == ch) {            int j = i;            while (mystr[j]) {                mystr[j] = mystr[j + 1];                j++;            }        }        i++;    }}

实现void DeleteSub(const char *sub)：

void EditString::DeleteSub(const char *sub) {    int i, j;    for (i = 0; i < len; i++) {        int k = i;        for (j = 0; sub[j] != '\0'; j++, k++) {            if (sub[j] != mystr[k]) break;        }        if (sub[j] == '\0') {            int len = strlen(sub);            int m = i + len;            while (mystr[m - 1]) {                mystr[m - len] = mystr[m];                m++;            }        }    }}

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