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Small problem with strings in java

post #1 of 34
Thread Starter 
My assignment requires me to read individual characters off a string. Here's the code.
Code:
public static boolean checkSum(String isbn){
int sum=0;
int i=0;
while(i<9){
int x=isbn.charAt(i);
int y=(10-i);
System.out.println(i+" "+x+" "+y+" "+sum);
sum=sum+(y*x);
i++;
}
if(isbn.charAt(9)=='X'){
sum=sum+10;
}
else{
sum=sum+(isbn.charAt(9));
}
System.out.println(sum);
if(sum%11==0){
return true;
}
else{
return false;
As a result I couldn't use an array. The string that I used was "1231231231". However when I used the charAt() function to use individual characters, I got 49, 50 and 51 instead of 1, 2 and 3. As a result, my sum equalled to a very high value(around 2000) instead of 103. Please help me out. It will be appreciated. Thanks in advance.
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post #2 of 34
Your problem is here:
Code:
int x=isbn.charAt(i);

You are setting an int variable equal to a string/char. You should try parsing or converting to char to an int:
Code:
int x = Integer.ParseInt(isbn.charAt(i));

Also this is more personal preference, but I would recommend using a for loop in this situation instead of a while loop. I use while loops to do work until the condition is met (while something is false do work). For simple counting or if I know the number of loops that need to be made, I use a for loop.
Code:
for (int i=0;i<9;i++)
{
    //do work here
}
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post #3 of 34
Thread Starter 
I tired doing this but the error hasn't been resolved. Here's all of my code:
Quote:
public class test3 {
public static void main(String[] args) {
String isbn="3213213211";
validateIsbn(isbn);
}
public static boolean validateIsbn(String isbn){
//boolean cond1=lengthCheck(isbn);
//boolean cond2=rangeCheck(isbn);
boolean cond3=checkSum(isbn);
if(cond3){
System.out.println("it's a miracle!!!!!!");
return true;
}
else{
System.out.println("u suck");
return false;
}
}
public static boolean lengthCheck(String isbn){
if(isbn.length()!=10){
return false;
}
else{
return true;
}
}
public static boolean rangeCheck(String isbn){
int i=0;
if((isbn.charAt(9)>=0 && isbn.charAt(9)<10) || isbn.charAt(9)=='X'){
while(i<9){
if(isbn.charAt(i)<0 || isbn.charAt(i)>9){
return false;
}
else{
i++;
}
}
}
return true;

}
public static boolean checkSum(String isbn){
int sum=0;
for(int i =0;i<9;i++){
int x=Integer.parseInt(isbn, isbn.charAt(i));
int y=(10-i);
System.out.println(i+" "+x+" "+y+" "+sum);
sum=sum+(y*x);
}
if(isbn.charAt(9)=='X'){
sum=sum+10;
}
else{
sum=sum+(isbn.charAt(9));
}
System.out.println(sum);
if(sum%11==0){
return true;
}
else{
return false;
}
}
}

And here's the error that I'm getting:
Quote:
Exception in thread "main" java.lang.NumberFormatException: radix 51 greater than Character.MAX_RADIX
at java.lang.Integer.parseInt(Unknown Source)
at test3.checkSum(test3.java:46)
at test3.validateIsbn(test3.java:10)
at test3.main(test3.java:5)
What should I do now? Can I use a function other than charAt() altogether?
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post #4 of 34
the error you're getting is because you're using the wrong parseInt method. use this parseInt method that only takes 1 argument.
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post #5 of 34
Thread Starter 
Umm..could you please tell me what the code would be? I've looked at the page but I'm confused about how to write it.
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post #6 of 34
ok i think what you want to do is this
Code:
int x=Integer.parseInt(isbn.charAt(i));
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post #7 of 34
Thread Starter 
That was the first thing that I tried. The program doesn't compile if I write it that way.
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post #8 of 34
oops my bad. i forgot parseInt takes a string, not a char. try this
Code:
int x=Integer.parseInt(Character.toString(isbn.charAt(i)));
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post #9 of 34
Thread Starter 
IT WORKED! THANK YOU SO MUCH!! biggrin.gif +rep
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post #10 of 34
Thread Starter 
Can you please help me one more time? The method rangeCheck(String isbn) is always returning false. Can't understand why
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Hard DriveOSMonitorPower
Samsung HD502IJ 500GB Windows 7 Ultimate 32-bit Samsung SyncMaster 943 18.5" Stock 450W 
Case
some piece of junk... 
CPUMotherboardGraphicsRAM
i3-2310M HM65 Intel HD 3000 6 GB DDR3 
Hard DriveOS
750 GB Windows 7 Home Premium x64 
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First build
(13 items)
 
Pandoras Box
(13 items)
 
NV57H
(6 items)
 
CPUMotherboardGraphicsRAM
Phenom II X4 965 BE 4.0GHz @ 1.385V ASRock 970 Extreme 3 Gigabyte 650 Ti boost Mushkin Enhanced Silverline 4GB DDR3 1600 MHz 
RAMHard DriveOptical DriveCooling
Mushkin Enhanced Silverline 4GB DDR3 1600 MHz Seagate Barracuda 160GB  Samsung Noctua NH-D14 
MonitorPowerCaseMouse
Acer X223W Corsair VX550 Cooler Master Elite 430 TT E-Sports Theron 
Mouse Pad
Steelseries QcK Portal 2 
CPUMotherboardGraphicsRAM
E7500 @2.93 GHz Gigabyte G41M-ES2L Gigabyte HD 4650 2x 2 GB TwinMOS @ 800MHz 
Hard DriveOSMonitorPower
Samsung HD502IJ 500GB Windows 7 Ultimate 32-bit Samsung SyncMaster 943 18.5" Stock 450W 
Case
some piece of junk... 
CPUMotherboardGraphicsRAM
i3-2310M HM65 Intel HD 3000 6 GB DDR3 
Hard DriveOS
750 GB Windows 7 Home Premium x64 
  hide details  
Reply
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