Beginners November 2017

beginners@lists.squeakfoundation.org

18 participants
9 discussions

Why the variable "a" is different out of the loop when codes are executed as a whole or by two steps?
by RedTigerFish 18 Nov '17

18 Nov '17

Hello, friends. This problem which confuses me comes from a question <http://forum.world.st/quot-Print-specific-integers-quot-Error-message-how-t…> I asked in "Squeak - Beginners" days ago. These are some special integers: myArray := #(2 32 44 67 89 111 123) These special integers need to be specially labelled from integer 1 to 130. The rest normal numbers which myArray doesn't include will be printed also. Here's the code: *|a n myArray| myArray := #(2 32 44 67 89 111 123). n := 1. a := myArray at: n. 1 to: 130 do: [:i| i = a ifTrue: [ Transcript show: ('Special number: i = {1}, a = {2}' format: {i. a}). Transcript cr. n := n + 1. n = 8 ifTrue: [a := 'I am no longer a number'.] ifFalse: [a := myArray at: n. ]. ] ifFalse: [ Transcript show: ('i = {1}, a = {2}' format: {i. a}). Transcript cr. ]. ]. Transcript show: a; cr. 'Last line' * Now comes something that makes my head big. If I choose everything and do them, the last line, which should tell me what a is when program jumps out of the loop, exactly shows that a is "I am no longer a number". However, if I choose everything except the last line, and do them. After that, I do the last line. The output is nil. Why is a nil ? Why's that? In order to make my question explicit, I recorded a video: https://www.youtube.com/watch?v=pUQAEO4uSpk ----- Dig, dig where you are, Down below's well. Let those that walk in darkness shout, Down below's hell. -- Sent from: http://forum.world.st/Squeak-Beginners-f107673.html

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Does Smalltalk have "break" method to jump out of a loop ?
by RedTigerFish 17 Nov '17

17 Nov '17

In C loop, there is break method which allows the program to jump out of the loop when certain criteria has been met. What is the counterpart in Smalltalk if there's one? ----- Dig, dig where you are, Down below's well. Let those that walk in darkness shout, Down below's hell. -- Sent from: http://forum.world.st/Squeak-Beginners-f107673.html

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"Print specific integers" Error message, how to improve ?
by RedTigerFish 17 Nov '17

17 Nov '17

Hello, *what I want is:* >From integers 1 to 130, I want to print some specific integers already given in an array. They are: 2 32 44 67 89 111 123 which are stored in small-to-big order. *Here's my codes:* |a n myArray| myArray := #(2 32 44 67 89 111 123). n := 1. a := myArray at: n. 1 to: 130 do: [:i| i = a ifTrue: [ Transcript show: i; cr. n := n + 1. a := myArray at: n. ]. ]. The output is very good except for an Error Message. <http://forum.world.st/file/t371379/errormessage.png> By my current level, I have no idea why that Error Message appears. Q1: Why Error Message appears ? Q2: How can I improve that? ----- Dig, dig where you are, Down below's well. Let those that walk in darkness shout, Down below's hell. -- Sent from: http://forum.world.st/Squeak-Beginners-f107673.html

4 7

Does +, -, *, / have more precedence over power?
by RedTigerFish 12 Nov '17

12 Nov '17

I understand in Smalltalk numerical calculation, if without round brackets, everything starts being calculated from left to right. Nothing follows the rule of multiplication and division having more precedence over addition and subtraction. Like the following codes 3 + 3 * 2 The print output is 12 while in mathematics we get 9 But when I started to try power calculation, like 91 raisedTo: 3 + 1. I thought the answer should be 753572 What I actual get is 68574964 Why's that? Is it because that +, -, *, / have more precedence over power ? ----- Dig, dig where you are, Down below's well. Let those that walk in darkness shout, Down below's hell. -- Sent from: http://forum.world.st/Squeak-Beginners-f107673.html

4 3

How can Smalltalk codes in Squeak be automatically indented ?
by RedTigerFish 10 Nov '17

10 Nov '17

I was wondering if Squeak has some automatic indentation function to make codes in disorder become clean and well-indented in a flash, just like what we can do in VIM and MS VISUAL STUDIO. ----- Dig, dig where you are, Down below's well. Let those that walk in darkness shout, Down below's hell. -- Sent from: http://forum.world.st/Squeak-Beginners-f107673.html

4 5

How auto-complete suggestions ?
by Davis8988 10 Nov '17

10 Nov '17

Hello, I am new to Squeak, and I'm using squeack 5.1 all-in-one. How can I add auto-complete sentences/methods suggestion feature? It is really needed.. :/ Thank you ! David -- Sent from: http://forum.world.st/Squeak-Beginners-f107673.html

1 0

How to comment in Squeak Smalltalk?
by RedTigerFish 10 Nov '17

10 Nov '17

In Squeak programming , "comment " is very needed in order to make the source code easier for humans to understand and maintain. However, I find "//" and /* */ to be not working. What can I do in order to comment in Squeak programming ? ----- Dig, dig where you are, Down below's well. Let those that walk in darkness shout, Down below's hell. -- Sent from: http://forum.world.st/Squeak-Beginners-f107673.html

3 2

Squeak Smalltalk- How to make to “Transcript show” print more things?
by RedTigerFish 07 Nov '17

07 Nov '17

I am using Smalltalk to type in Transcript window a 1-9 multiplication table . Here is my code: *1 to: 9 do: [:i| 1 to: i do: [:j| Transcript show: j. Transcript show: ' * '. Transcript show: i. Transcript show: ' = '. Transcript show: j * i. Transcript show: ' '. ]. Transcript show: ' '; cr. ].* As can be seen, the above code, although working fine, looks far from beautiful and concise. I had hoped to write something like : *Transcript show: j '*' i '=' j * i.* Unfortunately, they are wrong. I remember C has a very nice way to handle that issue of mine. Like, *printf("%d * %d = %d ", j, i, j * i);* Is there a more elegant way to make Smalltalk codes elegant in this situation ? ----- Dig, dig where you are, Down below's well. Let those that walk in darkness shout, Down below's hell. -- Sent from: http://forum.world.st/Squeak-Beginners-f107673.html

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I've heard that Smalltalk is also an OS. How can I install Smalltalk on my X86 instead of Linux or windows?
by RedTigerFish 06 Nov '17

06 Nov '17

I've heard that Smalltalk is also an OS. How can I install Smalltalk on my X86 instead of Linux or windows? That must be of great fun to install Smalltalk on a bare-metal machine, isn't it? What are the steps to do that? Any tutorials? ----- Dig, dig where you are, Down below's well. Let those that walk in darkness shout, Down below's hell. -- Sent from: http://forum.world.st/Squeak-Beginners-f107673.html

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Beginners November 2017