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that helped ty \m/

The code is supposed to input a start an end and an interval which the program does fine... the problem is in the if(a != 'y' || a != 'Y' || a != 'n' || a != 'N') it enters the body even IF...

import java.io.*;
public class dowhile
{
public static void main(String[] args)
{

int START = 0;
int END = 0;
int STEP = 0;
String input = "";