numbers output formatting

[Vladimir Agafonkin]

Hi.

How can I pad a number with "0"-s to a speciefied length when it goes
to the output? It's a very simple newbie question, yet I haven't been
able to find an answer in Programming Ruby book and core library docs.

Say, we have a following code:

for i in 1..10 do
puts "num #{i}"
end

What I need to change in this little script to format the output so
that it looks like this?

num 01
num 02
....
num 10

Thanks in advance.

 

[Robert Klemme]

Hi.

How can I pad a number with "0"-s to a speciefied length when it goes
to the output? It's a very simple newbie question, yet I haven't been
able to find an answer in Programming Ruby book and core library docs.

Say, we have a following code:

for i in 1..10 do
puts "num #{i}"
end

What I need to change in this little script to format the output so
that it looks like this?

num 01
num 02
...
num 10

Thanks in advance.

http://www.ruby-doc.org/core/classes/Kernel.html#M002972

robert

 

[greg.rb]

just one way to do it:

for i in 1..10 do
printf("%02d \n", i)
end

c documentation has more on printf

 

[greg.rb]

just one way to do it:

for i in 1..10 do
printf("%02d \n", i)
end

c documentation has more on printf

i forgot to put in 'num':

for i in 1..10 do
printf("num %02d \n", i)
end

produces:
num 01
num 02
num 03
num 04
num 05
num 06
num 07
num 08
num 09
num 10

 

[ColorMystic]

I believe Java 5 has added printf as well.

 

[Si]

Hi.

How can I pad a number with "0"-s to a speciefied length when it goes
to the output? It's a very simple newbie question, yet I haven't been
able to find an answer in Programming Ruby book and core library docs.

Say, we have a following code:

for i in 1..10 do
puts "num #{i}"
end

What I need to change in this little script to format the output so
that it looks like this?

num 01
num 02
...
num 10

Thanks in advance.

also:

(1..10).each do |i|
puts "num #{'%02d' % i}"
end

 

[Austin Ziegler]

(1..10).each do |i|
puts "num #{'%02d' % i}"
end

(1..10).each do |i|
puts "num %02d" % i
end

-a

 

[Karl von Laudermann]

Bah, printf() is for wimps.

for i in 1..10 do
puts "num " + ("0" * (1 - Math.log10(i).truncate)) + i.to_s
end

Just increase the 1 to increase the number of zeros.

 

[Dumaiu]

Bah, printf() is for wimps.

for i in 1..10 do
puts "num " + ("0" * (1 - Math.log10(i).truncate)) + i.to_s
end

Just increase the 1 to increase the number of zeros.

Better make sure he knows that was a joke!