问题描述
我想调用模块中包含的子例程。该模块将保存在文件名为 my_mod.f95 的单独文件中。
module calc_mean
! this module contains two subroutines
implicit none
public :: calc_sum
public :: mean
contains
subroutine calc_sum(x,n,s)
! this subroutine calculates sum of elements of a vector
! x the vector
! n size of the vector
! s sum of elements of x
integer,intent(in):: n
real,intent(in):: x(n)
integer :: i
real,intent(out):: s
s=0
do i=1,n
s=s+x(i)
end do
end subroutine calc_sum
!
!
!
subroutine mean(x,xav)
! this subroutine calculates the mean of a vector
! x the vector
! n size of the vector
! xav mean of x
integer,intent(in):: x(n)
real,intent(out):: xav
real :: s
!
!
call calc_sum(x,s)
xav=s/n
end subroutine mean
end module calc_mean
我用'my_program.f95'
将主程序保存在另一个文件中program find_mean
! this program calculates mean of a vector
use calc_mean
implicit none
! read the vector from a file
integer,parameter ::n=200
integer :: un,ierror
character (len=25):: filename
real :: x(n),xav
un=30
filename='randn.txt'
!
OPEN (UNIT=un,FILE=filename,STATUS='OLD',ACTION='READ',IOSTAT=ierror)
read(un,*) x !
!
call mean(x,xav)
write (*,100) xav
100 format ('mean of x is',f15.8)
end program find_mean
当我用 geany 编译主程序时，出现以下错误消息。请帮帮我！
**
/ usr / bin / ld：/tmp/cctnlPMO.o：在函数MAIN__': my_program.f08:(.text+0x1e1): undefined reference to __ calc_mean_MOD_mean'中
collect2：错误：ld返回1退出状态
**
当我将主程序和模块都保存到同一文件并运行它时，一切都很好。
解决方法
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