I am programming in Java and want to convert an int into an array. For example I want to convert 122 into {1, 2, 2}. Do you have an idea how this works? Thanks in advance. I am not allowed to convert it into a string.
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1@udiboy1209 no. There is no possibility to use stringLLL– LLL2017-11-12 22:15:27 +00:00Commented Nov 12, 2017 at 22:15
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3 Answers
Here is the answer without using Math class
import java.util.Arrays;
class int_to_array
{
public static void main(String arg[])
{
int number = 122;
int length=0;
int org=number;
while(org!=0)
{
org=org/10;
length++;
}
int[] array = new int[length];
for(int i = 0; i < length; i++) {
int rem = number % 10;
array[length - i - 1] = rem;
number = number / 10;
}
System.out.println(Arrays.toString(array));
}
}
The following example uses pure arithmetical approach (without converting the number to string):
int number = 122;
List<Integer> digitList = new LinkedList<>();
while(number > 0) {
int d = number % 10; //get last digit
digitList.add(0, d);
number = number / 10; //omit last digit
}
Integer[] digits = digitList.toArray(new Integer[0]);
System.out.println(Arrays.toString(digits));
4 Comments
Z.Wo
Thanks, but I am not allowed to use math. functions - how can I do it without that?
IEE1394
Refactor the for loop to be a recursive function which skips if your 10based index is bigger than your number
LLL
Since you cannot use math you should find a method of get number of digits of the value. You can either implement your own log10 or do something like 'length=0;i=value;while(i:10>0.9){i=i/10;length++;}'
Elyor Murodov
@Z.Wo I updated the code, that doesn't use Math and length of the number.
This ends up in an endless loop - why that?
int input = readInt("Bitte geben Sie eine positive Zahl ein:");
while(input < 0) {
input = readInt("Bitte geben Sie eine positive Zahl ein:");
}
int number = input;
int length = 0;
int org = number;
while(org != 0) {
org = org / 10;
length++;
}
int[] inputArray = new int[length];
int i = 0;
while(i < inputArray.length) {
int rem = number % 10;
inputArray[length - i - 1] = rem;
number = number / 10;
i++;
}
String output = "{";
i = 0;
while(i < inputArray.length) {
output += inputArray[i];
if(i < inputArray.length-1) {
output += ", ";
}
i++;
}
output += "}";
System.out.print(output);
3 Comments
Arpit Agarwal
I have edited your code, check it now
Z.Wo
This is perfect!!!! Great. Thank you so much!!!!
Arpit Agarwal
Please mark the answer as accepted