writeln（）或writefln（）？

Question

Hello World for D看起来像这样：

import std.stdio;

void main(string[] args)
{
    writeln("Hello World, Reloaded");
}

来自http://www.digitalmars.com/d/

但是当我用gdc-4.4.5编译它时，我得到：

hello.d:5: Error: undefined identifier writeln, did you mean function writefln?
hello.d:5: Error: function expected before (), not __error of type _error_

这是D1 / D2吗？图书馆的东西？看来，writefln是一个stdio库函数，而writeln则不是。

Answer 1

是的，writeln仅适用于D2的标准库。

Answer 2

正如Cyber​​Shadow所提到的，writeln仅在D2中。它们之间的区别是writeln只是按原样打印其参数，而writefln将其第一个参数解释为格式字符串，如C＆＃39; printf。

示例：

import std.stdio;

void main() {
    // Prints "There have been 44 U.S. presidents."  Note that %s can be used
    // to print the default string representation for any type.
    writefln("There have been %s U.S. presidents.", 44);

    // Same thing
    writeln("There have been ", 44, " U.S. presidents.");
}