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What does null mean?

The word null has different meanings. In law it means having no legal or binding force, invalid, in mathematics it means having or associated with the value of zero. In computer science, it is a special pointer value used to signify that a pointer intentionally does not point to an object.
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How to Calculate Null Space.
1. Write your matrix out and then add an extra column of all zeros on the far right end with the same number of rows as the rest of your matrix. This is called augmented form. 2. Reduce the matrix in Step 1 to reduced row echelon form (see  www.ehow.com
Who is null?
umm. that's actually reallyyy tuff. no one knows yet.  wiki.answers.com
How to Check Null in C.
1. The pointer to compare to is called. yourPointer. in the code snippet below. Ad. 2. A sample of a properly coded check for NULL in C is: if ( NULL = yourPointer ) {   /* do what you do when it's NULL */. else. {   /* do what you do when it is not  www.wikihow.com
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