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# How to read long interger?

Posted on 2000-05-16
Medium Priority
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I am writting a program and I use sscanf to read data from a file:

sscanf(line, "%ld %lf\n", &a, &b);

The fiel contains data like following:

6000000.000  0.734581
23900000000.000  0.674805
24000000000.000   0.606476
24100000000.000   0.521484

As I read in the first line, it's ok. But from the second line, I got problem. The a is not the value it is but -1869635475. It's an error. It seems the integer is too big. How can I solve the problem?
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Question by:chenwei
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ozo earned 80 total points
ID: 2813625
23900000000 does not fit in a 32 bit integer. Unless your system supports 36 or 64 bit integers, you may want to scan  %lf instead.
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LVL 4

Expert Comment

ID: 2814328
The limit is  4,294,967,295 for unsigned long values and 2,147,483,647 for signed long values.

You would have to read in your line differently and deal with creating your own math routines if you have to deal with these numbers as non-floats or non-doubles (i.e. integers) in calculations.

You could, for example take the right-most 9 characters and keep track of that as Billionths and the remaining left-most characters as Billions.
Your numbers would become a struct ...

struct _UglyNumber
{
unsigned long billionths;
unsigned long billions;
unsigned short sign;
}

You would probably do better to use a float or double.

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LVL 4

Expert Comment

ID: 2815274
looks like these values are floats, not integers... use the %lf as ozo suggested...
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