JAVA Programming for School

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Sorry for this delay.

Write a program in Java to accept a number n (between 1 and 9) and print all possible combinations of '+' and '-' of all natural numbers till n such that their sum is 0.

Eg:
Input: n=7
Output:
-1-2+3-4+5+6-7=0

-1-2+3+4-5-6+7=0

-1+2-3-4+5-6+7=0

-1+2+3+4+5-6-7=0

+1-2-3-4-5+6+7=0

+1-2+3+4-5+6-7=0

+1+2-3-4+5+6-7=0

+1+2-3+4-5-6+7=0

Hint: Logic is to generate a table of (n * 2^n) and fill each row with its binary equivalent of its index. That gives you all the possible combinations of pluses and minuses.
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Source Code:

class Sequence
{
boolean arr[][];int n;
void bin(int a)
{
n=a;
int b= (int)Math.pow(2,n);
arr= new boolean[b][n];
int cnt=0;
for (int i=0;i=0;j--)
{
if (r%2==1)
arr[i][j]=true;
else
arr[i][j]=false;
r/=2;
}
}
}
void printSum(int a)
{
this.bin(a);
int s=0;int x=1;
int b= (int) Math.pow(2,a);
String str="";
for (int i=0;i

Tomorrow is the day..........Indian Council of Secondary Education (I.C.S.E.) Exam fro Computer Applications. Best of Luck to all our friends. We hope we could contribute something to your success..........