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

问题描述

我需要逐个符号阅读.但我不知道如何阅读，直到输入结束.例如，测试系统将 cin>>somecharvariable m 次.我必须逐个符号阅读所有字符.只有m次.我该怎么做?

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

如果您想逐个字符地格式化输入，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
}

如果您想读取原始字节，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
}

在任何一种情况下，infile 都应该是 std::istream & 或类似的类型，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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