Press these keys on iPhone calculator:
5 + 5 =
Unsurprisingly, the answer is 10. But keep on pressing the = sign and this is the output:
10, 15, 20, 25, 30, 35, 40, 45 … and so on
Why is this useful?
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It's an auto-constant
Whether or not you find it useful depends on what you want to do.
Your method of just hitting
= over & over just repeats the last calculation, so
2 * 2 = 4
= 32 etc
But, say you needed to calculate tax on a set of payments at 15%
If you want just the tax, type
100 * 0.15 =
then your amounts
87.20 = 13.08
43.57 = 6.55
12.50 = 1.88 etc..
If you wanted the amount including tax, you'd start with
100 * 1.15 = & off you go with your amounts, as above...
From comments - this function has been on calculators [in slightly different ways] since at least the mid-70s. It's not a new feature.
On the early ones,
2*=======... would quickly just
ERR. Since then they've got somewhat more flexible & move to scientific notation.