问题描述
我正在学习Fortran,因为我认为我会学习它。然而,我完全没有发现打印,阅读等目的*的信息: 程序main
print *,你好,世界!
end program main
这个<$ c $的目的是什么C> * ?我已经做了一些研究,但我认为我没有正确理解,我不想继续学习,直到我真正知道 *
的要点。
从我设法找到的我认为它是某种格式说明符,然而,我不明白这意味着什么,我不知道我是否甚至正确。我找到的所有教程都告诉我要写什么来打印到控制台,但不是 *
实际上意味着什么。
您正确的是它是一个格式说明符。
Wikibooks上有一个关于并表明:
读取的格式的格式>读取语句。这也适用于 write
和 print
语句。
他们给出的例子是
REAL :: A
READ(*,'(F5.2)')A
读取小数点前后两位数的实数。因此,如果您打印的是实际的号码,您可以使用:
PRINT'(F5.2)',A
得到四舍五入的输出结果。
你只是打印文本,所以没有特殊的格式。另外,如果您将格式说明符保留为 *
,它会将默认格式应用于reals等。
I am learning Fortran because well, yeah, thought I'd learn it. However, I've found utterly no information on what the purpose of * is in print, read, etc:
program main
print *, "Hello, world!"
end program main
What is the purpose of this *
? I've done some research however I don't think I understand it properly, I don't want to carry on learning until I actually know the point of *
.
From what I've managed to find I think that it's some sort of format specifier, however, I don't understand what that means and I have no idea if I'm even correct. All the tutorials I've found just tell me what to write to print to the console but not what *
actually means.
You are correct in that it is a format specifier.
There's a page on Wikibooks to do with IO and that states:
when talking about the read
statement. This applies to the write
and print
statements too.
And the example they give is
REAL :: A
READ(*,'(F5.2)') A
which reads a real number with 2 digits before and after the decimal point. So if you were printing a real number you'd use:
PRINT '(F5.2)', A
to get the rounded output.
In your example you're just printing text so there's no special formatting to do. Also if you leave the format specifier as *
it will apply the default formatting to reals etc.
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