C ++ cin char按符号读取 [英] C++ cin char read symbol-by-symbol

问题描述

我需要逐个符号读取。但我不知道如何读取，直到输入结束。例如测试系统将会有一些变化m次。我必须逐个符号读取所有字符。只有m次。

I need to read symbol-by-symbol. But I don't know how to read until end of input. As exemple test system will cin>>somecharvariable m times. I have to read symbol-by-symbol all characters. Only m times. How I can do it?

推荐答案

如果需要逐个字符格式化输入，请执行以下操作：

If you want formatted input character-by-character, do this:

char c;
while (infile >> c)
{
  // process character c
}

如果要读取原始字节，请执行以下操作：

If you want to read raw bytes, do this:

char b;
while (infile.get(b))
// while(infile.read(&b, 1)   // alternative, compare and profile
{
  // process byte b
}

无论如何， infile 应该是 std :: istream& 类型，例如文件或 std :: cin 。

In either case, infile should be of type std::istream & or similar, such as a file or std::cin.

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