Assignment5

Write a function to reverse an integer using numeric operators and without using any arrays or other data structures.

The signature of the function is int f(int n)

if the input integer is	return
1234	4321
12005	50021
1	1
1000	1
0	0
-12345	-54321

Solution

public class Assignment5 {
  public static void main(String[] args) {
    int result = f(1234);
    System.out.println(result);

    result = f(12005);
    System.out.println(result);

    result = f(1);
    System.out.println(result);

    result = f(0);
    System.out.println(result);

    result = f(-12345);
    System.out.println(result);
  }

  static int f(int n) {
    if (n == 0) {
      return 0;
    }
    int reverse = 0;
    while (n != 0) {
      reverse = (reverse * 10) + ( n % 10);
      n /= 10;
    }
    return reverse;
  }
}