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#include <iostream>
#include <fstream>
#include <string>
int main()
{
std::ifstream ifile("hello.txt");
std::ofstream ofile("hello_copy.txt");
// 忽略文件对象判断的过程
ifile.unsetf(std::ios::skipws); // 设置不跳过空白符的flag
char ch{};
while (ifile >> ch) // 如果没有上方语句，可以ifile.get(ch)
ofile << ch;
ifile.close(); // 如没有这两个函数析构函数也可关闭，但建议显式书写
ofile.close();
return 0;
}
