1 void test_write() 2 { 3     const int TEST_SIZE = 100000000; 4     const char* c_plus_write_file = "H://c_plus_write_file.txt"; 5     const char* c_write_file = "g://c_write_file.txt"; 6  7     cout << "Test size :" << TEST_SIZE << endl; 8     //c++ style writing file   9     ofstream of(c_plus_write_file);10     //assert(of);11     time_t start, end;12     start = clock();13     for (int i = 0; i < TEST_SIZE; ++i)14     {15         char tmp[1];16         tmp[0] = char(i);17         of.write(tmp, 1);18     }19     end = clock();20     of.close();21     cout << "C++ style: " << end - start << " ms" << endl;22     //c style writing file  23     FILE* fp;24     fopen_s(&fp, c_write_file, "w");25     start = clock();26     for (int i = 0; i < TEST_SIZE; ++i)27     {28         char tmp[1];29         tmp[0] = char(i);30         fwrite(tmp, 1, 1, fp);31     }32     end = clock();33     fclose(fp);34     cout << "C style: " << end - start << " ms" << endl;35     cin.get();36 }37 38 //机器配置：39 //vs2015,vs201740 //intel(R)Core(TM)i7-6700HQ CPU@2.6GHZ 2.59GHZ41 //16.0GB内存 64位操作系统42 //测试结果：BUF_SIZE越大，C++与C风格时间差越大，数据如下：43 //BUF_SIZE= 1000: c++平均90ms c平均80ms44 //BUF_SIZE= 100000000: c++平均70ms c平均30ms45 //这是读取测试，对于写入操作二者相关则更显著：BUF_SIZE= 100000000: c++平均25秒 c平均20秒46 void test_read()47 {48     const char* read_file = "g://c_write_file.txt";49     const int BUF_SIZE = 100000000;50     //char buf[BUF_SIZE];51     char* buf = new char[BUF_SIZE];52     time_t start, end;53 54     //c style writing file  55     FILE* fp = fopen(read_file, "rb");56     assert(fp);57     start = clock();58     int len = 0;59     do60     {61         len = fread(buf, 1, BUF_SIZE, fp);62         //cout<
     
      <