Communities

Writing
Writing
Codidact Meta
Codidact Meta
The Great Outdoors
The Great Outdoors
Photography & Video
Photography & Video
Scientific Speculation
Scientific Speculation
Cooking
Cooking
Electrical Engineering
Electrical Engineering
Judaism
Judaism
Languages & Linguistics
Languages & Linguistics
Software Development
Software Development
Mathematics
Mathematics
Christianity
Christianity
Code Golf
Code Golf
Music
Music
Physics
Physics
Linux Systems
Linux Systems
Power Users
Power Users
Tabletop RPGs
Tabletop RPGs
Community Proposals
Community Proposals
tag:snake search within a tag
answers:0 unanswered questions
user:xxxx search by author id
score:0.5 posts with 0.5+ score
"snake oil" exact phrase
votes:4 posts with 4+ votes
created:<1w created < 1 week ago
post_type:xxxx type of post
Search help
Notifications
Mark all as read See all your notifications »
Users Search
Help Dashboard Sign In Sign Up
Challenges Q&A Sandbox Meta
Challenges
Posts Tags Edits
Post Challenge

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
user card
General Sebast1an‭
1221 reputation 53 97 130 328
History
Why does this post require attention from curators or moderators?
You might want to add some details to your flag.
Why should this post be closed?

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)

23 answers

Score Active Age
+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
user card
Zakk‭
189 reputation 0 19 17 29
History
Why does this post require attention from curators or moderators?
You might want to add some details to your flag.

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)
+0
−0

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
user card
General Sebast1an‭
1221 reputation 53 97 130 328
History
Why does this post require attention from curators or moderators?
You might want to add some details to your flag.

2 comment threads

18-byte version (1 comment)
Lambda (1 comment)
+0
−0

J, 17 char

+/`5:@.(2*./@:=])

How it works: What's within parentheses tests if both numbers on the right are 2. If so, the verb agenda @. selects the verb 5: which is always 5. If not, the verb agenda @. selects the verb +/ which sums the numbers.

    +/`5:@.(2*./@:=]) 2 2
5
    +/`5:@.(2*./@:=]) 2 3
5
    +/`5:@.(2*./@:=]) 1 3
4
    +/`5:@.(2*./@:=]) 0 4
4
    +/`5:@.(2*./@:=]) 3 7
10
posted over 2 years ago
2y ago
user card
torres‭
111 reputation 0 17 11 28
History
Why does this post require attention from curators or moderators?
You might want to add some details to your flag.

0 comment threads

Sign up to answer this question »