如題;這是一套完整的可運行的代碼;需要讀者有一定的基礎去閱讀;
語言是用C語言實現;在C++環境中編寫;在C++中可直接運行;在C語言中需要改部分頭文件和輸出語句;
頭文件;這要是代碼的聲明部分;
# ifndef _HEAPSTRING_
# define _HEAPSTRING_
# include <iostream>
using namespace std;
typedef struct
{
char * str;
int len;
}HeapStirng, * PHeapString;
PHeapString InitString(void);
void ClearString(PHeapString H);
void DestroyString(PHeapString * pH);
int LengthString(PHeapString H);
bool EmptyString(PHeapString H);
bool AssignString(PHeapString H, const char * const p);
bool CopyString(PHeapString dest, PHeapString src);
bool SubString(PHeapString dest, PHeapString src, int pos, int len);
bool ContactString(PHeapString dest, PHeapString src1, PHeapString src2);
bool InsertString(PHeapString dest, int pos, PHeapString src);
bool Deletestring(PHeapString dest, int pos, int len);
# endif
實現文件;主要是代碼的實現;
# include "HeapString.h"
PHeapString InitString(void)
{
PHeapString H = (PHeapString)malloc(sizeof(HeapStirng));
if (NULL == H)
{
cout << "Memory allocate is error! " << endl;
system("pause");
exit(0);
}
else
{
H->str = NULL;
H->len = 0;
return H;
}
}
void ClearString(PHeapString H)
{
if (NULL != H->str)
{
free(H->str);
H->str = NULL;
H->len = 0;
}
return;
}
void DestroyString(PHeapString * pH)
{
PHeapString H = *pH;
free(H->str);
H->str = NULL;
H->len = 0;
free(H);
H = NULL;
*pH = NULL;
return;
}
bool AssignString(PHeapString H, const char * const str)
{
//釋放原內存空間;避免內存泄露;
ClearString(H);
//定義迭代變量;
int len = 0;
const char * p = str;
//求字符串長度;
for (len = 0; *p != '\0'; len++, p++);
//申請內存空間;
char * q = (char *)malloc(sizeof(char) * (len + 1));//爲了添加字符串結束標識符需要多申請一個字節內存;
if (NULL == q)
{
//返回失敗;
return false;
}
else
{
//爲指針賦值;
for (int i = 0; i < len; i++)
{
q[i] = str[i];
}
q[len] = '\0';
H->str = q;
//爲字符串長度賦值;
H->len = len;
//返回成功;
return true;
}
}
int LengthString(PHeapString H)
{
return (H->len);
}
bool EmptyString(PHeapString H)
{
if (0 == LengthString(H))
{
return true;
}
else
{
return false;
}
}
bool CopyString(PHeapString dest, PHeapString src)
{
//釋放原內存空間;避免內存泄露;
ClearString(dest);
//申請內存空間;
char * p = (char *)malloc(sizeof(char) * (src->len + 1));
if (NULL == p)
{
//返回失敗;
return false;
}
else
{
//爲指針賦值;
for (int i = 0; i < src->len; i++)
{
p[i] = src->str[i];
}
p[src->len] = '\0';
dest->str = p;
//爲字符串長度賦值;
dest->len = src->len;
//返回成功;
return true;
}
}
bool SubString(PHeapString dest, PHeapString src, int pos, int len)
{
ClearString(dest);
if (pos < 1 || pos > src->len || len < 0 || len > src->len - pos + 1)
{
return false;
}
char * p = (char *)malloc(sizeof(char) * (len + 1));
if (NULL == p)
{
return false;
}
else
{
for (int i = 0; i < len; i++)
{
p[i] = src->str[i + (pos - 1)];
}
p[len] = '\0';
dest->str = p;
dest->len = len;
return true;
}
}
bool ContactString(PHeapString dest, PHeapString src1, PHeapString src2)
{
ClearString(dest);
char * p = (char *)malloc(sizeof(char) * (src1->len + src2->len + 1));
if (NULL == p)
{
return false;
}
else
{
int i = 0;
for (; i < src1->len; i++)
{
p[i] = src1->str[i];
}
for (; i < src1->len + src2->len; i++)
{
p[i] = src2->str[i - src1->len];
}
p[src1->len + src2->len] = '\0';
dest->str = p;
dest->len = src1->len + src2->len;
return true;
}
}
bool InsertString(PHeapString dest, int pos, PHeapString src)
{
if (pos < 1 || pos > dest->len + 1)
{
return false;
}
dest->str = (char *)realloc(dest->str, sizeof(char) * (dest->len + src->len + 1));
if (NULL == dest->str)
{
return false;
}
else
{
for (int i = dest->len - 1; i >= pos - 1; i--)
{
dest->str[i + src->len] = dest->str[i];
}
dest->str[dest->len + src->len] = '\0';
for (int i = pos - 1; i < pos - 1 + src->len; i++)
{
dest->str[i] = src->str[i - (pos - 1)];
}
dest->len += src->len;
return true;
}
}
bool Deletestring(PHeapString dest, int pos, int len)
{
if (pos < 1 || pos > dest->len)
{
return false;
}
for (int i = pos - 1; i < dest->len - len; i++)
{
dest->str[i] = dest->str[i + len];
}
dest->str = (char *)realloc(dest->str, sizeof(char) * (dest->len - len + 1));
dest->str[dest->len - len] = '\0';
return true;
}
Main函數;
# include "HeapString.h"
int main(int argc, char ** argv)
{
PHeapString H = InitString();
AssignString(H, "qinjiawei");
PHeapString HH = InitString();
AssignString(HH, " is a boy!");
PHeapString HHH = InitString();
AssignString(HHH, "good ");
PHeapString dest = InitString();
SubString(dest, H, 1, 3);
cout << dest->str << endl;
if (ContactString(dest, H, HH))
{
cout << dest->str << endl;
}
if (InsertString(dest, 16, HHH))
{
cout << dest->str << endl;
}
if (Deletestring(dest, 1, 9))
{
cout << dest->str << endl;
}
system("pause");
return 0;
}