Reading data file in Fortran with known number of lines but unknown number of entries in each line

Question

How can I read the data file containing known number of lines but the number of entries in each line is unknown, e.g. if my data file contain some thing like

Answer 1

This is a program that can count numbers in a line (or number of columns) but for a line. If you have many lines, you should change it slightly.

program test12

implicit none

integer n,m,i

integer,allocatable::x(:)

 open(10,file='C:\Users\user\Desktop\file.txt')

allocate(x(n))

20 n=n+1

 deallocate(x) 



 allocate(x(n))

read(10,*,iostat=m)(x(i),i=1,n)

if (m==-1)then

goto 30

else


rewind 10

 goto 20

end if

 30 print*,n-1

 end