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Thread: Modifying a String of 10 digits
 10282011, 07:49 PM #1Member
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Modifying a String of 10 digits
Hi again.
suppose my program reads in a string from the user. The string represents a 10 digit codword
an example input would be:
0079584584
I now run a series of equations to determine if any character's need changing. possibilities are:
1) no characters need replacing
2) 1 character needs replacing
3) two characters need replacing
So supposed my equations determined that 1 character need replacing. say this character was the 7 in the above String of 10 digits and it needed replacing with a 9 to create a valid 10 digit codeword.
how do i go about this?
I have researched and i dont think the String.Replace() will work with this?
 10282011, 07:53 PM #2
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Re: Modifying a String of 10 digits
You can get the characters in a String with the toCharArray() method. You can later (after changing one or more characters in the array) build a String out of the char array again.
kind regards,
Joscenosillicaphobia: the fear for an empty beer glass
 10282011, 08:05 PM #3Member
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Re: Modifying a String of 10 digits
okay so my String which reads in the 10 digits is called 'input'
I am trying your way so i have:
char[] arr = input.toCharArray();
I have an int 'i'  which represents the position of the error. so the digit that needs replacing is at index: (i1) because indexing starts at 0 obviously and 'i' only represents the position i.e. 1st digit, 2nd digit, 3rd digit, etc. rather than the actual index.
and i have an int called 'modified' which represents the new value that needs to be put in the string.
How do i now put 'modified' in at index (i1), replacing the original value
I hope this makes sense
 10282011, 08:11 PM #4
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 10282011, 08:18 PM #5Member
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Re: Modifying a String of 10 digits
Are you still suggesting the toArrayChar way then?
Its just my Lewis and Loftus Java Software Solutions book doesnt have anything on this.
And i cant find anything online using toArrayChar() and replacing.
 10282011, 08:21 PM #6
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Re: Modifying a String of 10 digits
cenosillicaphobia: the fear for an empty beer glass
 10282011, 08:25 PM #7Member
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Re: Modifying a String of 10 digits
My idea was create an array with the 10 integers
d1 = Integer.parseInt(String.valueOf(input.charAt(0)));
d2 = Integer.parseInt(String.valueOf(input.charAt(1)));
d3 = Integer.parseInt(String.valueOf(input.charAt(2)));
d4 = Integer.parseInt(String.valueOf(input.charAt(3)));
d5 = Integer.parseInt(String.valueOf(input.charAt(4)));
d6 = Integer.parseInt(String.valueOf(input.charAt(5)));
d7 = Integer.parseInt(String.valueOf(input.charAt(6)));
d8 = Integer.parseInt(String.valueOf(input.charAt(7)));
d9 = Integer.parseInt(String.valueOf(input.charAt(8)));
d10 = Integer.parseInt(String.valueOf(input.charAt(9)));
[]d = {d1, d2, d3, d4, d5, d6, d7, d8, d9, d10};
and replace one of those with the new value
but again there is not alot of information about on replacing values in arrays with new ones.
The ArrayList uses the simple .add() and .remove() but i think this going way off the point of my task.
 10282011, 08:27 PM #8Member
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Re: Modifying a String of 10 digits
Sorry, didnt see your post.
 10282011, 08:45 PM #9Member
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Re: Modifying a String of 10 digits
Im trying to replace it with an int and it seems your way requires a char value.
int modified = Integer.parseInt(String.valueOf(input.charAt(i1))) + a;
char[] c = input.toCharArray();
c[i1]= modified; // change it
input = new String(c); // build a new String
I am getting possible loss of precision, required: char dound : int
regards
 10282011, 08:48 PM #10
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 10282011, 08:52 PM #11Member
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Re: Modifying a String of 10 digits
Thanks, i actually researched this but there are a lot of pages saying the converted int will just be the ASCII value rather than converting the int "1" to a char "1"
I will try this
 10282011, 08:55 PM #12
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Re: Modifying a String of 10 digits
cenosillicaphobia: the fear for an empty beer glass
 10282011, 09:21 PM #13Member
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Re: Modifying a String of 10 digits
Will that way not work then mate?
 10282011, 09:24 PM #14
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Re: Modifying a String of 10 digits
cenosillicaphobia: the fear for an empty beer glass
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