继续在gfortran 5.2.0 [英] Continuation in gfortran 5.2.0

问题描述

我需要在我的Macbook Pro上使用Fortran90代码，这是多年前在Microsoft Developer Tools上编写的。作为一个免费的选项，我在我的Macbook上安装了 gfortran 来编译它。原始代码包含& 长字符串的连续字符，但我无法使用它。没有& 字符，一切正常。可能是什么问题？我是否需要激活某些功能才能使用& 字符？

例如，我认为应该这样：

  x = 1 
y = 2 
z = x + 
& y 
 end 
  

但是，我有这个错误。这可能是行结束错误。我该如何解决它？

  3:72：错误：表达式中的语法错误（1）
 4：9：错误：无效字符（1）
  

解决方案

在自由格式的Fortran ，行末尾的续行字符（& ）将继续。您的代码应为：

 程序测试
x = 1 
y = 2 
z = x +& amp ; 
y 
结束程序
  

这在Fortran标准（此处为2008 ，但也适用于Fortran 90），Cl。 3.3.2.4自由格式语句的继续：

<1>字符&用于表示语句在下一行不是注释行。 [b]

2如果要继续使用非字符上下文，则&应该是行上的最后一个非空字符，或最后一个非空字符在！之前。 [...]

I need to work on Fortran90 code on my Macbook Pro, which was written on Microsoft Developer Tools years ago. As a free option, I have installed gfortran on my Macbook to be able to compile it. The original code includes & continuation character for the long lines but I am not able to use it. Without & character, everything works fine. What might be the problem? Do I need to activate something to be able to use & character?

For example, I think something like this should work:

x = 1 
y = 2 
z = x+ 
&y 
end

But instead, I am having this error. It might be end of line error. How can I solve it?

3:72: Error: Syntax error in expression at (1) 
4:9: Error: Invalid character in name at (1) 

解决方案

In free-form Fortran, the line continuation character (&) at the end of the line to be continued. Your code should read:

program test
  x = 1 
  y = 2 
  z = x+ &
  y 
end program

This is stated in the Fortran Standard (here: 2008, but applicable as well for Fortran 90), Cl. 3.3.2.4 "Free form statement continuation":

1 The character "&" is used to indicate that the statement is continued on the next line that is not a comment line. [...]

2 If a noncharacter context is to be continued, an "&" shall be the last nonblank character on the line, or the last nonblank character before an "!". [...]

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