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字節(jié)拷貝函數(shù)：

void * memcpy1(void *dest, const void *src, size_t n){        assert(dest!=NULL&&src!=NULL);    //有效性檢測(cè)        if(dest == src)                return dest;        else if(dest < src)        {                const char *c_src = static_cast<const char *>(src);                char *c_dest = static_cast<char *>(dest);                while (n--) *c_dest++ = *c_src++;        }        else        {                const char *c_src = static_cast<const char *>(src) + n - 1;                char *c_dest = static_cast<char *>(dest) + n - 1;                while (n--) *c_dest-- = *c_src--;        }        return dest;} 

字符串比較函數(shù)：

char *strcpy(char *des, const char *src)  {      assert(des != NULL && src != NULL);      char *pStr = des;      while( (*des++ = *src++) != '\0')          NULL;      return pStr;  }  

字符串比較函數(shù)：

int  strcmp(const char *des,  const char *src)  {      assert(des != NULL && src != NULL);      for (;*des && *src && *des == *src; des++, src++)          NULL;      return *des - *src;  }  

字符串長(zhǎng)度函數(shù)：

int strlen(const char *pStr)  {      assert(pStr != NULL);      int len = 0;      while (*pStr++ != '\0')          len++;        return len;  }  

字符串連接函數(shù)：

char *strcat(char *des, const char *src)  {      assert(*des != NULL && *src != NULL);      char *pStr = des;      while (*des != '\0')          des++;        while ((*des++ = *src++) != '\0')          NULL;      return pStr;  } 

字符串查找函數(shù)：

char *myStrstr(const char *des, const char *src)  {      assert(des != NULL && src != NULL);        char *d = des;      char *s = src;        for (; d != '\0'; des++)      {          for (d = des, s = src; (s != '\0') && (*d == *s); d++, s++)              NULL;            if (*s == '\0')          return des;      }            return NULL;    }