void CTestDLLDlg::OnBnClickedButton6()

{

    const int size = ;

    char* data = new char[size];

    memset(data, , size - );

    char* data1 = new char[size];

    memset(data1, 'a', size - );

    clock_t begin = clock();

    for (int i = ; i < size; ++i)

    {

        memmove(data1, data, size);

    }

    clock_t end = clock();

    double duration = ;

    duration = (double)(end - begin) / CLOCKS_PER_SEC;

    CString str = _T("");

    str.Format(_T("-不同指针复制- %f---\n"), duration);

    OutputDebugString(str);

    clock_t begin1 = clock();

    for (int i = ; i < size; ++i)

    {

        memmove(data1, data1, size);

    }

    clock_t end1 = clock();

    double duration1 = ;

    duration1 = (double)(end1 - begin1) / CLOCKS_PER_SEC;

    CString str1 = _T("");

    str1.Format(_T("-同指针复制- %f---\n"), duration1);

    OutputDebugString(str1);

    clock_t begin2 = clock();

    for (int i = ; i < size; ++i)

    {

    }

    clock_t end2 = clock();

    double duration2 = ;

    duration2 = (double)(end1 - begin1) / CLOCKS_PER_SEC;

    CString str2 = _T("");

    str2.Format(_T("-空循环- %f---\n"), duration2);

    OutputDebugString(str2);

    delete data;

    data = nullptr;

    delete data1;

    data1 = nullptr;

}