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public class thousands {

public static void main(String args[]) {

/* Tests */

writeNum(12345678);

System.out.println();

writeNum(77);

System.out.println();

writeNum(12345);

System.out.println();

writeNum(1);

System.out.println();

writeNum(1345678901);

System.out.println();

}

/* Recursive method writes an integer number formated with commas */

public static void writeNum(int n) {

// Condition to stop the recursion.

if(n < 1000) {

System.out.print(n);

return;

}

writeNum(n / 1000);

System.out.print("," + n % 1000);

}

}