#I need help with this for loops question

1 messages · Page 1 of 1 (latest)

arctic pikeBOT
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<@&987246399047479336> please have a look, thanks.

arctic pikeBOT
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onyx ravine
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u need another loop to repeat symbol x many times

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🙂

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what's the code to print 5 stars

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*****

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put that code inside ur current code

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then adjust the 5 to what tells u how many u need in this line

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and done

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step by step 🙂

austere python
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Kinda something like this:

String userInputChar
String loopGraphic = ""
for loop
{
    loopGraphic += userInputChar
    print loop iteration + " " + loopGraphic
}```
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Essentially, you're concatenating a string every time you do loop

onyx ravine
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that works as well, yes

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also, Srring.repeat(...) is a thing

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but i guess the assignment is to teach loops and hence is looking for the classic basic solution

austere python
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Kind of, yeah

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The term you're looking for is "concatenation"

onyx ravine
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they just star with one star and then they add another star the next iteration, making it two, and so on

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but really, this task is simple if u approach it step by step

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u know how to write the code to print *****

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so just take that code and put it inside ur current code

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and boom ur done

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that's the transfer this exercise wants u to make in ur head

austere python
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Kind of, although you may need to add a variable

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So, before the for loop, you create the string

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String loopGraphic = "";```
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If you make the variable inside of the loop, every time it loops, it's going to make the variable blank again

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That's why we define it before the loop

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Then, with the loop, every time it goes through once, you do something called "concatenation" which is defined as combining two strings into one

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For example, if we had this piece of code:

String firstName = "Dev"
String lastName = "Dom"
System.out.print("Hello, "+firstName+" "+lastName);```
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We initialize the first name and the last name, then in the print statement, we concatenate (or combine) a few strings: "Hello, ", the users first name, a space, then the last name

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In that example, we concatenated strings

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So, going back to the assignment, before the loop, you define the string that is going to be concatenated to

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Then, every time it goes through the loop, we concatenate the user input to the variable

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Let's go through the first iteration and assume the user input is *

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We initialize the string and it's just blank: " "

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Then, we can concatenate * to it

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So " " + " * " = " * "

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And then we print it

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Then, let's do the second iteration

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This time, when we do the concatenation, the variable is equal to " * "

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And let's add another

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" * " + " * " = " ** "

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Alright, let's go to the third iteration

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This time, the variable is equal to " ** "

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Let's concatenate

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" ** " + " * " = " *** "

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And it keeps looping like that for as many times as you'd like

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.
.
Does this help at all?

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@uncut basalt

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Is there any chance you could show the full error?

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Or is that it?

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Oh perfect

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Wait then where did you see this?

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Well yes LOL but I meant the specific picture

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Where did the picture come from?

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Ohh gotcha

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Yeah that's fine in the context of this problem

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Hmm.. Given this method, I'm not sure there is a way to get rid of the warning

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The only other way to do this would be to nest another for loop inside of the for loop you currently have

onyx ravine
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the warning is about using StringBuilder instead

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sinxe += is a performance problem

austere python
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Ohh that would make sense

unborn karma
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actually, the += uses the StringBuilder class
so using the StringBuilder is faster

onyx ravine
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and += isn't using stringbuilder

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it was pre java 9, but even then the point was that it only applied it to the concat in this particular line, not across the loop - which is the actual performance problem

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and hence the warning

unborn karma
onyx ravine
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but that never applied beyond a single line

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so u still have the issue in a loop like OP

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and with java 9, this optimization was improved further, it's not using stringbuilder anymore

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In any case, to get rid of the warning that OP got, they have to use stringbuilder across the loop

austere python
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The more you know

unborn karma
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ooooh ty