Fortran:整数太大了 [英] Fortran: Integer too big for its kind

问题描述

我正在将一个整数设置为小于其最大值的值，但收到一个错误，指出它太大了，不合适.为什么是这样?这是一个示例程序.

I am setting an integer to a value less than its maximum, but receiving an error that it is too big for it's kind. Why is this? Here is a sample program.

program max_int

integer, parameter :: i32 = selected_int_kind(32)

integer(kind = i32) :: my_int

!The largest integer of this kind
print*, huge(my_int)

!This works
my_int = 100000

!This doesn't, and gives an error.
!my_int = 1000000000000

print*, my_int

end program

推荐答案

您需要将 i32 附加到 1000000000000 如下: 1000000000000_i32.gfortran 抱怨这个数字太大了.1000000000000 是短整数，不是超长整数.1000000000000_i32 是一个超长整数.它不是在抱怨变量，而是在抱怨常量.

You need to append the i32 to 1000000000000 like this: 1000000000000_i32. gfortran complains that the number is too big for it's kind. 1000000000000 is a short integer, not a super long integer. 1000000000000_i32 is a super long integer. It is not complaining about the variable, it's complaining about the constant.

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