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problem in fscanf

Aritra

 Hi ,

     I am tring to scan a file and extract only thelines which has 2 integer. eg :

120 230

I am using the fscanf to do the job like fscanf(PortDef "%d %d\n" VarName)

Its flags error for the above code. 

Please assist.

Parents
  • Andrew Beckett

    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.

Reply
  • Andrew Beckett

    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.

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