<div>
The limit is &nbsp;4,294,967,295 for unsigned long values and 2,147,483,647 for signed long values.<br />
<br />
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.<br />
<br />
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.<br />
Your numbers would become a struct ...<br />
<br />
struct _UglyNumber<br />
{<br />
&nbsp; &nbsp;unsigned long billionths;<br />
&nbsp; &nbsp;unsigned long billions;<br />
&nbsp; &nbsp;unsigned short sign;<br />
}<br />
<br />
You would probably do better to use a float or double.<br />
<br />

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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.



<div>
looks like these values are floats, not integers... use the %lf as ozo suggested...
</div>


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

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<div class="content wysiwyg-content">
I am writting a program and I use sscanf to read data from a file:<br />
<br />
sscanf(line, &quot;%ld %lf\n&quot;, &amp;a, &amp;b);<br />
<br />
The fiel contains data like following:<br />
<br />
6000000.000 &nbsp;0.734581<br />
23900000000.000 &nbsp;0.674805 &nbsp;<br />
24000000000.000 &nbsp; 0.606476 &nbsp;<br />
24100000000.000 &nbsp; 0.521484 &nbsp;<br />
<br />
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?<br />

</div>
</div>


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?


How to read long interger?

C is a general-purpose, imperative computer programming language, supporting structured programming, lexical variable scope and recursion, while a static type system prevents many unintended operations. By design, C provides constructs that map efficiently to typical machine instructions, so it has found lasting use in applications that had formerly been coded in assembly language, including operating systems as well as various application software for computers ranging from supercomputers to embedded systems. It is distinct from C++ (which has its roots in C) and C#, and many later languages have borrowed directly or indirectly from C.