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Full Discussion: Array Elements Check
Top Forums Programming Array Elements Check Post 302931312 by Corona688 on Monday 12th of January 2015 12:29:17 PM
Old 01-12-2015
This is what's going wrong:

Code:
scanf("%d", &x);

The first time you run it, it sees a number and scans it.

The second time you run it, it hits whitespace of some sort -- a space or newline. This is not a digit, so it gives up.

The third time you run it, it hits the same whitespace. It's going to just keep slamming its head into the wall over and over again.

In summary, don't use scanf, it's a royal pain. Read lines yourself, tokenize them yourself, then use sscanf if you must. It will never pull this trick on you.

Code:
char buf[512];
int arr[10];

while(fgets(buf, 512, stdin))
{
        int n=0;
        char *tok=strtok(buf, " \r\n\t"); // Split on any whitespace, including newlines (which fgets includes).

        while(tok != NULL)
        {
                if(sscanf(tok, "%d", arr+n) != 0)
                {
                        n++;
                        tok=strtok(NULL, " \r\n\t"); // Keep splitting on the last string we gave it until done.
                        continue;
                }

                break;
        }

        printf("scanned %d numbers\n", n);
}


Last edited by Corona688; 01-12-2015 at 01:37 PM..
 

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JE::Object::Array(3pm)					User Contributed Perl Documentation				    JE::Object::Array(3pm)

NAME
JE::Object - JavaScript Array object class SYNOPSIS
use JE; use JE::Object::Array; $j = new JE; $js_array = new JE::Object::Array $j, 1, 2, 3; $perl_arrayref = $js_array->value; # returns [1, 2, 3] $js_array->[1]; # same as $js_array->value->[1] "$js_array"; # returns "1,2,3" DESCRIPTION
This module implements JavaScript Array objects. The "@{}" (array ref) operator is overloaded and returns a tied array that you can use to modify the array object itself. The limitations and caveats mentioned in "JE::Object/"USING AN OBJECT AS A HASH"" apply here, too. METHODS
See JE::Types for descriptions of most of the methods. Only what is specific to JE::Object::Array is explained here. $a = JE::Object::Array->new($global_obj, @elements) $a = JE::Object::Array->new($global_obj, $length) $a = JE::Object::Array->new($global_obj, @elements) This creates a new Array object. If the second argument is an unblessed array ref, the elements of that array become the elements of the new array object. If there are two arguments and the second is a JE::Number, a new array is created with that number as the length. Otherwise, all arguments starting from the second one become elements of the new array object. $a->value This returns a reference to an array. This is a copy of the Array object's internal array. If you want an array through which you can modify the object, use @$a. SEE ALSO
JE JE::Types JE::Object perl v5.14.2 2012-03-18 JE::Object::Array(3pm)
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