Re: Suggested method for returning a string from a C program?

On 19/03/2025 20:45, DFS wrote:

On 3/19/2025 4:53 AM, Keith Thompson wrote:

<snip>

I'm actually using
scanf() for integer input, something I wouldn't do in normal code
(because the behavior is undefined if the scanned value is out
of range).  This is a rare case where it's safe to assume that
stdin has nothing harmful.

   My very 1st submission for 'Missing Number' was accepted, but each use of scanf() generated a warning:

Like Keith, I don't usually use scanf.
My preference is to read the number into a text buffer using fgets, and then convert it using strtoul if I can, or strtol if I have to allow for negatives.

//identify the missing number in a set of consecutive integers

Not sure why you're sorting and malloc-ing.
Loop through the input, adding as you go.
Let the first number be x.
Let the last number be y.
Let the total of all numbers be t.
Let m = ((y*(y+1))-(x*(x+1)))/2 - t;
"The missing number is: %lld\n", m
--
Richard Heathfield
Email: rjh at cpax dot org dot uk
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