In the context of puzzles such as this:
Write a program that outputs all possibilities to put + or - or nothing between the numbers 1,2,…,9 (in this order) such that the result is 100. For example 1 + 2 + 3 - 4 + 5 + 6 + 78 + 9 = 100.
Is there a name for the "nothing"-operation between 7 and 8?
What it would do is I think: let a,b be positive integers
$a$ nothing $b= a\times 10 +b$
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