problem in fscanf

It generally helps if  you actually say what the error you're seeing is.

In this case (assuming you showed the code properly above), the error is because you are asking for two integers, yet only supplied the name of one variable to put them in. So you'd get:

 fscanf(a "%d %d\n" VarName)
*Error* fscanf: too many format specs. - ("%d %d\n" VarName)

If you did:

 fscanf(a "%d %d\n" VarName1 VarName2)

it would work. Note that fscanf returns the number of items it actually read - so if it successfully read two integers, it would return 2. If it hits something other than an integer in the input stream, it would return less than 2, and subsequent calls would probably return 0 - the pointer in the file would not proceed.

I'm having to guess a bit as to what your problem really is - but hopefully some of the above will help.

Andrew.

 Hi Andrew,

                 Sorry for not informing about the error properly.

I did the modification you mentioned. Now the error is not there but an infinite loop is running resulting some junk data. My entire code is:

list_so_far=list()
var1=var2=0
PortDef=infile("~/file.txt")
when(PortDef
    while(fscanf(PortDef "\n%d %d\n" var1 var2)
        list_so_far=append1(list_so_far var1)
        list_so_far=append1(list_so_far var2)
    );while
close(PortDef)
);when

The file.txt contains lines like-

p 1 4

23 34

43 65

765 9

0 345

p 1 4

213 354

43 685

765 95

70 345

I am interested in [213 354] like lines only not [p 1 4] ie the lines starting and ending with integer only.

Please assist.