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题目描述：

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 <
   

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

EditString es("testtesttest");es.IsSubString(3,"test");//4

实现EditChar(char s, char d)，用字符d代替所有字符s，例如：

EditString es("testtesttest");es.EditChar('t','a');//"aesaaesaaesa"

实现void EditSub(char * subs,char *subd)，用字符串subd代替所有字符串subs，例如：

EditString es("testtesttest");es.EditChar(“test”,“str”);//"strstrstr"

实现void DeleteChar(char ch)，将所有ch字符删除，例如：

EditString es("testtesttest");es.DeleteChar('t');//"eseses"

实现void DeleteSub(char * sub)，将所有的字符串sub删除，例如：

EditString es("testtesttest");es.DeleteSub(”es“);//"tttttt";

实现：

#include"CString.h"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;}void EditString::EditChar(char s, char d){   	int i = 0;	while (mystr[i])	{   		if (mystr[i] == s)			mystr[i] = d;		i++;	}}void EditString::EditSub(const char* subs,const char* subd)//提交时去掉const{   	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])//注意			{   				mystr[m + len_d - len_s] =mystr[m];				m++;			}			m = 0;			while (subd[m])			{   				mystr[i + m] = subd[m];				m++;			}						i += (len_d-1);		}	}}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++;	}}void EditString::DeleteSub(const char* sub)//提交时去掉const{   	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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