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Comments on Make $2 + 2 = 5$

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Make $2 + 2 = 5$

+7
−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 over 3 years ago
3y ago by user‭
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General Sebast1an‭
1221 reputation 53 97 130 328
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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)
Post
+2
−1

C (gcc), 41 bytes

f(x,y){int r=x*y;return r&&r==x+y?5:x+y;}

Attempt This Online!

posted over 2 years ago
12mo ago
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Zakk‭
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2 comment threads

Incorrect answer (1 comment)
But the task asks for integers ($\mathbb Z$), not natural numbers ($\mathbb N$). Thus the code should... (1 comment)
Incorrect answer
Lundin‭ wrote over 1 year ago · edited over 1 year ago
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f(1,4) returns 5 so your solution is not correct... Similarly this algorithm is wrong in many other answers you have posted here too. To use your own math example, the correct algorithm would have to be result = x*y; if(result==x+y) return 5; else return x*y;.