如何在while循环中添加距离？

Question

I am supposed to add the distance of a walker's position after N steps. I run the while T times and need to add all of the N steps after T trails and divide by the amount of trials to get an average. This is my code so far. Iv tried doing a different integer like distance/T but it says that distance isn't found. Is that because it is defined in the while loop. I am using processing.

import javax.swing.JOptionPane;
String input=JOptionPane.showInputDialog("Steps");
int x=Integer.parseInt(input);
if (x<0)
{
    System.out.println("Error. Invalid Entry.");
}
int T=1;
int N=0;
while (T<10)
{
    while (N<x)
    {
        int stepsX=Math.round(random(1,10));
        int stepsY=Math.round(random(1,10));
        System.out.println(stepsX+","+stepsY);
        N=N+1;
        if (N==x)
        {
            int distance=(stepsX*stepsX)+(stepsY*stepsY);
            System.out.println(distance);
        }
    }
    T=T+1;
    N=0;
}
System.out.println("mean sq. dist = ");

Answer 1

I'm assuming it's because you're not keeping track of total distance. Also, your distance int variable only exists in the scope:

        if (N==x)
        {
            int distance=(stepsX*stepsX)+(stepsY*stepsY);
            System.out.println(distance);
        }

Read more about scopes here: Scope of do-while loop?

It's kind of unclear what you need, but here is some changes I made that I think will help:

import javax.swing.JOptionPane;
String input=JOptionPane.showInputDialog("Steps");
int x=Integer.parseInt(input);
if (x<0)
{
    System.out.println("Error. Invalid Entry.");
}
int T=1;
int N=0;
double totalDistance = 0.0;//keep track over over distance;
while (T<10)
{
    while (N<x)
    {
        int stepsX=Math.round(random(1,10));
        int stepsY=Math.round(random(1,10));
        System.out.println(stepsX+","+stepsY);
        N=N+1;
        if (N==x)
        {
            int distance=(stepsX*stepsX)+(stepsY*stepsY);
            totalDistance = totalDistance + distance;
            System.out.println("current distance:  " + distance);
            System.out.println("current total distance:  " + totalDistance);
        }
    }
    T=T+1;
    N=0;
}
//calculate whatever you need using totalDistance
System.out.println("mean sq. dist = " + (totalDistance/T) );

Answer 2

This would be my answer, you seem to be loosing all of your steps except last one in a while loop.

import javax.swing.JOptionPane;
String input=JOptionPane.showInputDialog("Steps");
int x=Integer.parseInt(input);
if (x<0)
{
    System.out.println("Error. Invalid Entry.");
}
int T=1;
int N=0;
int stepsX = 0;
int stepsY = 0;
while (T<10)
{
    while (N<x)
    {
        stepsX += Math.round(random(1,10));
        stepsY += Math.round(random(1,10));
        System.out.println(stepsX+","+stepsY);
        N=N+1;
        if (N==x)
        {
            int distance=(stepsX*stepsX)+(stepsY*stepsY);
            System.out.println(distance);
        }
    }
    T=T+1;
    N=0;
}
double distance = Math.sqrt(Math.pow(stepsX, 2) + Math.pow(stepsY, 2));
System.out.println("mean sq. dist = "+distance);

But please if it is not rephrase your question.