C++风格与C风格文件读写效率测试-vs2015,vs2017

 void test_write()
 {
     const int TEST_SIZE = ;
     const char* c_plus_write_file = "H://c_plus_write_file.txt";
     const char* c_write_file = "g://c_write_file.txt";

     cout << "Test size :" << TEST_SIZE << endl;
     //c++ style writing file
     ofstream of(c_plus_write_file);
     //assert(of);
     time_t start, end;
     start = clock();
     for (int i = ; i < TEST_SIZE; ++i)
     {
         char tmp[];
         tmp[] = char(i);
         of.write(tmp, );
     }
     end = clock();
     of.close();
     cout << "C++ style: " << end - start << " ms" << endl;
     //c style writing file
     FILE* fp;
     fopen_s(&fp, c_write_file, "w");
     start = clock();
     for (int i = ; i < TEST_SIZE; ++i)
     {
         char tmp[];
         tmp[] = char(i);
         fwrite(tmp, , , fp);
     }
     end = clock();
     fclose(fp);
     cout << "C style: " << end - start << " ms" << endl;
     cin.get();
 }

 //机器配置：
 //vs2015,vs2017
 //intel(R)Core(TM)i7-6700HQ CPU@2.6GHZ 2.59GHZ
 //16.0GB内存 64位操作系统
 //测试结果：BUF_SIZE越大，C++与C风格时间差越大，数据如下：
 //BUF_SIZE= 1000: c++平均90ms c平均80ms
 //BUF_SIZE= 100000000: c++平均70ms c平均30ms
 //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
 void test_read()
 {
     const char* read_file = "g://c_write_file.txt";
     const int BUF_SIZE = ;
     //char buf[BUF_SIZE];
     char* buf = new char[BUF_SIZE];
     time_t start, end;

     //c style writing file
     FILE* fp = fopen(read_file, "rb");
     assert(fp);
     start = clock();
     int len = ;
     do
     {
         len = fread(buf, , BUF_SIZE, fp);
         //cout<<len<<endl;
     } while (len != );
     end = clock();
     fclose(fp);
     cout << "C style: " << end - start << " ms" << endl;

     //c++ style writing file
     ifstream ifs(read_file, ios::binary);
     assert(ifs);
     start = clock();
     while (!ifs.eof())
     {
         ifs.read(buf, BUF_SIZE);
     }
     end = clock();
     ifs.close();
     cout << "C++ style: " << end - start << " ms" << endl;

     delete[] buf;
     cin.get();
 }