在fortran90中智能打印整数 [英] Smart printing of integers in fortran90

问题描述

几年前简要介绍了Fortran77之后，我正在学习Fortran90.在Fortran中打印整数时，必须指定要保留多少空间来打印整数.考虑这个程序...

I'm learning Fortran90 after a brief introduction to Fortran77 a few years ago. When printing integers in Fortran, you must specify how many spaces you want to reserve for printing the integer. Consider this program...

implicit none

integer :: i
i = 123

write(*, '(A, I3, A)')  "'", i, "'"  !3 spaces for output = no padding
write(*, '(A, I5, A)')  "'", i, "'"  !5 is too many, so output is padded
write(*, '(A, I2, A)')  "'", i, "'"  !2 is too few, so output is jibberish
write(*, '(A, I:, A)')  "'", i, "'"  !Default behavior

end program

...将生成以下输出.

...which generates the following output.

'123'
'  123'
'**'
'         123'

当我不知道整数中有多少位数时，如何为整数打印分配正确的空间?

How do I allocate the correct amount of space for integer printing when I do not know how many digits are in the integer?

更新:如果您的编译器兼容F95，则可以使用I0编辑描述符(即，在上面的示例中，将'(A, I0, A)'用作write函数的第二个参数)谢谢@janneb！

Update: If your compiler is F95-compliant, you can use the I0 edit descriptor (i.e., put '(A, I0, A)' for the second argument of the write function in my example above. Thanks @janneb!

推荐答案

使用I0编辑描述符.好吧，要成为适用于Fortran 95的学究型IIRC，因此，如果您真的严格要求不超过F90，那么我想这是行不通的.

Use the I0 edit descriptor. Well, to be pedantic IIRC that is Fortran 95, so if you're really strict about no more than F90, then I suppose this won't work.

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