java problem

[jeremyhilg08]

Hey guys, I hope somebody can help. I'm writing a program to reverse a number, and I'm getting an error code and can't figure out why. Hope someone can help. Thanks

import java.util.*;
class Assign4B
{
public static void main(String[]args)
{
int number;
int x;
int reversenumber;
Scanner input = new Scanner(System. in);
System.out.prin tln("Please type a four-digit number for x");
number = input.nextInt() ;
number = x;
int ones;
int tens;
int hundreds;
int thousands;
thousands = x / 1000;
x -= thousands * 1000;
hundreds = x / 100;
x -= hundreds * 100;
tens = x / 10;
x -= tens * 10;
ones = x;
x = ones*1000 + tens*100 + hundreds*10 + thousands;
System.out.prin tf("Reverse:%8. 2f",x);
}
}


out:variable x has not been initialized??

[jimhawkss]

Your taking in a string and trying to make it backwards right?
try a simple for loop.
Let's pretend your input string is called input and it contains 1234.

tempInt = input.length(); //might not need the () can't remember atm.
string outPut = ""
for (int c = 0; c <= tempInt; tempInt--)
{
char tempChar = input.getChar(t empInt);
outPut += tempChar
}

then just printline your outPut string.... and you should get 4321.

Hopefully that helps

[kedmotsoko]

import java.util.*;
class Assign4B
{
public static void main(String[]args)
{
int number;
int x;
int reversenumber;
Scanner input = new Scanner(System. in);
System.out.prin tln("Please type a four-digit number for x");
number = input.nextInt() ;
//number = x;..THE OTHER WAY ROUND!!
x= number;
int ones;
int tens;
int hundreds;
int thousands;
thousands = x / 1000;
x -= thousands * 1000;
hundreds = x / 100;
x -= hundreds * 100;
tens = x / 10;
x -= tens * 10;
ones = x;
x = ones*1000 + tens*100 + hundreds*10 + thousands;
//System.out.prin tf("Reverse:%8. 2f",x);..INTERG ER CAN"T BE FORMATED TO 2 DECIMAL PLACE
System.out.prin tln(x);
}
}

[JosAH]

Your taking in a string and trying to make it backwards right?
try a simple for loop.
Let's pretend your input string is called input and it contains 1234.

tempInt = input.length(); //might not need the () can't remember atm.
string outPut = ""
for (int c = 0; c <= tempInt; tempInt--)
{
char tempChar = input.getChar(t empInt);
outPut += tempChar
}

then just printline your outPut string.... and you should get 4321.

Hopefully that helps

If you want to reverse a String (that might accidentally look like a number) please
let the core classes do the dirty work. Have a look at the StringBuilder.r everse()
method.

kind regards,

Jos

[jeremyhilg08]

import java.util.*;
class Assign4B
{
public static void main(String[]args)
{
int number;
int x;
int reversenumber;
Scanner input = new Scanner(System. in);
System.out.prin tln("Please type a four-digit number for x");
number = input.nextInt() ;
//number = x;..THE OTHER WAY ROUND!!
x= number;
int ones;
int tens;
int hundreds;
int thousands;
thousands = x / 1000;
x -= thousands * 1000;
hundreds = x / 100;
x -= hundreds * 100;
tens = x / 10;
x -= tens * 10;
ones = x;
x = ones*1000 + tens*100 + hundreds*10 + thousands;
//System.out.prin tf("Reverse:%8. 2f",x);..INTERG ER CAN"T BE FORMATED TO 2 DECIMAL PLACE
System.out.prin tln(x);
}
}

Thanks alot for the help. It worked out fine.