I started learning java not quite long but now I am faced with this problem in the screenshot.
I don't know why it happens like this. Please someone should proffer a solution. Thanks.

You are multiplying String with Integer why not cast to int before doing that, read a proper book

pcguru1:
You are multiplying String with Integer why not cast to int before doing that, read a proper book

Thank you pcguru1 for your swift response. According to what I read, "you can assign char values to int variables". But neverthrless I did what u suggested. See The same thing

Or could you please give me an alternative in getting single integer values from integers without first converting to string and using charAt?

Stop wasting your time go and read a Java book that's not how you cast string to it, you use the Integer class check the Javadoc API read the fundamentals and data types for a start , Charat returns a String which is why Interger classes were created though am interested how that number came to be. I might try to find out tomorrow

HealerC:
Or could you please give me an alternative in getting single integer values from integers without first converting to string and using charAt?

Integer
https://docs.oracle.com/javase/7/docs/api/java/lang/Integer.html

So I hate being curious I was intrigued as to why you got 1323 so when you say Charat it fetched the index 0 which points to 1 however in this case '1' and the fact that you used Interger you forced char to be converted to decimal in which in the Ascii table that's a 49 and you multiplied that by 27 which gave you your result. You're lucky you didn't exceed 256 past the size of the char I don't think it would have been a result you'd be able to explain.

255 sorry not 256

pcguru1:
So I hate being curious I was intrigued as to why you got 1323 so when you say Charat it fetched the index 0 which points to 1 however in this case '1' and the fact that you used Interger you forced char to be converted to decimal in which in the Ascii table that's a 49 and you multiplied that by 27 which gave you your result. You're lucky you didn't exceed 256 past the size of the char I don't think it would have been a result you'd be able to explain.

WTF

pcguru1:
255 sorry not 256

Thank you very much bros

HealerC:

WTF

ASCII when memory was scare and highest was 2 bytes so they thought of smart ways to hold data.

pcguru1:


Integer
https://docs.oracle.com/javase/7/docs/api/java/lang/Integer.html

Sorry to disturb you but I dont have much experience in reading documentations yet.

Could you point it to me, please?

Integer.valueof you also need to learn reading Java Docs and OOP too, working on enterprise systems mehn you will need to, and Java docs is anything but straight forward

pcguru1:
Integer.valueof you also need to learn reading Java Docs and OOP too, working on enterprise systems mehn you will need to, and Java docs is anything but straight forward

Thank you so much, I'll try it.
Whats enterprise system¿

pcguru1:


ASCII when memory was scare and highest was 2 bytes so they thought of smart ways to hold data.

Why Didnt they just leave it as 1

HealerC:

Thank you so much, I'll try it.
Whats enterprise system¿

Ignore I said that

HealerC:

Why Didnt they just leave it as 1

1 and '1' are not the same go and read data type , you can't question a bunch of smart researchers who built this ,because its what the world runs on, they'd prob have a smart reason for that.

use Integer.parseInt (g.charAt(m)) to cast from "1" to 1

babawarunn:
As pcguru1 said. Go and read a good java book. I recommend Java How to program.

This is the solution you need if you want to go about it the way you have written your code.

System.out.println(Integer.parseInt(String.valueOf(g.charAt(m))) * (int) Math.pow(b, a));

g.chartAt(m) : returns char '1'

String.valueOf('1') : returns String "1"

Integer.parseInt("1" : returns integer 1

1 * 27 = 27.

There is no shortcut. Take time to read a good java book, you will avoid mistakes like this.

Thanks I realized I sent value of instead of parseInt

pcguru1:


Thanks I realized I sent value of instead of parseInt

babawarunn:
As pcguru1 said. Go and read a good java book. I recommend Java How to program.

This is the solution you need if you want to go about it the way you have written your code.

System.out.println(Integer.parseInt(String.valueOf(g.charAt(m))) * (int) Math.pow(b, a));

g.chartAt(m) : returns char '1'

String.valueOf('1') : returns String "1"

Integer.parseInt("1" : returns integer 1

1 * 27 = 27.

There is no shortcut. Take time to read a good java book, you will avoid mistakes like this.

sunsyde:
use Integer.parseInt (g.charAt(m)) to cast from "1" to 1

pcguru1:


1 and '1' are not the same go and read data type , you can't question a bunch of smart researchers who built this ,because its what the world runs on, they'd prob have a smart reason for that.

pcguru1:

Ignore I said that

Thank you all so very much
But is there a way to just do it automatically like, for instance if u have a string "story" u can get charat index 1 using charAt1 to get t
so is there a way for instance integer 1234 to get just a particular integer let's say 3. WITH IT STILL BEING AN INTEGER. something like that, please

Supposing I want to make a basic cmd program that will solve number bases and convert them to base 10

HealerC:

Thank you all so very much
But is there a way to just do it automatically like, for instance if u have a string "story" u can get charat index 1 using charAt1 to get t
so is there a way for instance integer 1234 to get just a particular integer let's say 3. WITH IT STILL BEING AN INTEGER. something like that, please

An integer is a decimal charat is for string , that would mean you convert int to String and use a char at and convert back to Int but that's an odd operation what's the purpose for ?

pcguru1:


An integer is a decimal charat is for string , that would mean you convert int to String and use a char at and convert back to Int but that's an odd operation what's the purpose for ?

Any other function apart from charAt?

HealerC:

Any other function apart from charAt?

Dude seriously just stop and go and read a proper book, This is hand holding, do some research and stuff , WHat i said suffices already just go and read a book, it will save you all this question asking.

pcguru1:


Dude seriously just stop and go and read a proper book, This is hand holding, do some research and stuff , WHat i said suffices already just go and read a book, it will save you all this question asking.

Thank you very much sir
But a book can't possibly contain ALL functions

HealerC:

Thank you very much sir
But a book can't possibly contain ALL functions

No but it will teach you how to read JavaDocs especially when you realize everything is an Object and there's a class that handles what you need. if you had read a book you would come across the things needed for what you are asking, parsing String as Int, because your question clearly shows you need to even understand Computer Data types first before even java

Note: Methods i don't think function is the right word though

pcguru1:


No but it will teach you how to read JavaDocs especially when you realize everything is an Object and there's a class that handles what you need. if you had read a book you would come across the things needed for what you are asking, parsing String as Int, because your question clearly shows you need to even understand Computer Data types first before even java

Yeah.... even that parse integer method (Integer.parseInt([typechar])) you guys gave me compiled well but when I executed it it gave NumberFormatException

Perhaps I will have to learn Javadocs.... thah na later sha.... I may soon pause learning java to concentrate on other things

Thanks for your input so far, twas an eye opener

pcguru1:


Note: Methods i don't think function is the right word though

Please kindly use an IDE or a proper code editor. It's a Nigerian mentality that will tell you to use notepad first because you are a beginner.

You still need to be to able to tell what line you are making a mistake, distinct colours for code keywords are important, then you will also be able to properly account for code indentation.

HealerC:

Yeah.... even that parse integer method (Integer.parseInt([typechar])) you guys gave me compiled well but when I executed it it gave NumberFormatException

Perhaps I will have to learn Javadocs.... thah na later sha.... I may soon pause learning java to concentrate on other things

Thanks for your input so far, twas an eye opener

A NumberFormat Exception means you tried to convert a non numerical to an integer e.g "S" to a number

You are using notepad for coding ... You remind me of me when i first started.
Your problems will multiply going that route.
Get an ide or a java programming text editor like notepad++.
Download the documentation for your language. It's essential.
It seems your arent learning in a structured disciplined manner but just trying things out - maybe using web snippets or youtube videos. Get a good book- and slug through it,that way you wont come here asking
redundant questions.

asalimpo:
You are using notepad for coding ... You remind me of me when i first started.
Your problems will multiply going that route.
Get an ide or a java programming text editor like notepad++.
Download the documentation for your language. It's essential.
It seems your arent learning in a structured disciplined manner but just trying things out - maybe using web snippets or youtube videos. Get a good book- and slug through it,that way you wont come here asking
redundant questions.

exactly which makes it more annonying, these are question you can google and solve, I think dev of this gen have too much hand-holding, when i was learning programming Stack Overflow and Programming communities didn't exist.