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Comments on Make $2 + 2 = 5$

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Make $2 + 2 = 5$

+6
−3

In this challenge, add 2 integers, but if both the integers are 2, output 5. Shortest code in each language wins!

Example ungolfed program in Python 3.x 

def add(x, y):
	if x == 2 and y == 2:
		return 5
	else:
		return x + y

Try it online!

code-golf math number
posted about 3 years ago
3y ago by user‭
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General Sebast1an‭
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2 comment threads

"integers" - should this work for negative integers? At least one answer I checked (but I suspect sev... (1 comment)
"Preferably" on a function? (2 comments)
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+0
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Java (JDK), 51 50 23 21 bytes

x->y->x==y&y==2?5:x+y

Try it online!

Golfed 27 bytes thanks to @Moshi's advice. Golfed 2 bytes thanks to @user's advice on Discord.

posted about 3 years ago
3y ago
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General Sebast1an‭
1211 reputation 53 97 129 328
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Why does this post require attention from curators or moderators?
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2 comment threads

18-byte version (1 comment)
Lambda (1 comment)
18-byte version
Zakk‭ wrote over 2 years ago
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You can shorten your code by comparing x*y against 4:

x->y->x*y==4?5:x+y

There are 3 possibilities:

$$x=2,y=2 \Longrightarrow x \times y = 5 \text{ as of the rules}$$ $$x=1,y=4 \Longrightarrow x + y = 5 \text{ still a valid result}$$ $$x=4,y=1 \Longrightarrow x + y = 5 \text{ still a valid result}$$

In all cases, the code outputs the correct value.