我对编程还比较陌生,但似乎 ASCII
标准字符集中并没有包含 π(pi)
符号。
我想知道是否有办法让控制台输出 π
符号,以便精确表达某些数学公式的答案。
除了使用STL之类的其他方法,我不是很确定,但是你可以使用Win32来完成这个操作,使用WriteConsoleW:
HANDLE hConsoleOutput = GetStdHandle(STD_OUTPUT_HANDLE);
LPCWSTR lpPiString = L"\u03C0";
DWORD dwNumberOfCharsWritten;
WriteConsoleW(hConsoleOutput, lpPiString, 1, &dwNumberOfCharsWritten, NULL);
#include <iostream>
#include <string>
#include <io.h>
// We only need one mode definition in this example, but it and several other
// reside in the header file fcntl.h.
#define _O_WTEXT 0x10000 /* file mode is UTF16 (translated) */
// Possibly useful if we want UTF-8
//#define _O_U8TEXT 0x40000 /* file mode is UTF8 no BOM (translated) */
void main(void)
{
// To be able to write UFT-16 to stdout.
_setmode(_fileno(stdout), _O_WTEXT);
// To be able to read UTF-16 from stdin.
_setmode(_fileno(stdin), _O_WTEXT);
wchar_t* hallå = L"Hallå, värld!";
std::wcout << hallå << std::endl;
// It's all Greek to me. Go UU!
std::wstring etabetapi = L"η β π";
std::wcout << etabetapi << std::endl;
std::wstring myInput;
std::wcin >> myInput;
std:: wcout << myInput << L" has " << myInput.length() << L" characters." << std::endl;
// This character won't show using Consolas or Lucida Console
std::wcout << L"♔" << std::endl;
}
微软CRT不太懂Unicode,因此可能需要绕过它并直接使用WriteConsole()
。我假设您已经编译为Unicode,否则您需要明确使用WriteConsoleW()