Two-dimensional random walk (20 points). A two-dimensional random walk simulates the behavior of a particle moving in a grid of
points. At each step, the random walker moves north, south, east, or west with probability equal to 1/4, independent of previous moves. Write a program RandomWalker.java that takes an int command-line argument n and simulates the motion of a random walk for n steps. Print the location at each step (including the starting point), treating the starting point as the origin (0, 0). Also, print the square of the final squared Euclidean distance from the origin as double. Note: you do not need arrays for this problem, just keep track of the x and y coordinates during the random walk.
1 answer:
Answer:
The following code in the explanation does the job for you. Here I have made use of Random class of Java to generate random numbers.
Explanation:
Code:
import java.util.*;
class RandomWalker {
public static void main(String args[]){
int n = Integer.parseInt(args[0]);
int x = 0;
int y = 0;
Random random = new Random();
for(int i = 0; i < n; i++){
int tmp = random.nextInt(4);
if(tmp == 0){
x++;
}
if(tmp == 1){
y++;
}
if(tmp == 2){
y--;
}
if(tmp == 3){
x--;
}
System.out.println("(" + x + "," + y + ")");
}
int distance = x*x + y*y;
System.out.println("Squared Distance = " + distance);
}
}
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Answer:
1st question:
Use the variables k, d, and s so that they can read three different values from standard input an integer, a float, and a string respectively. On one line, print these variables in reverse order with exactly one space in between each. On a second line, print them in the original order with one space in between them.
Solution:
In Python:
k = input() #prompts user to input value of k i.e. integer value
d = input() #prompts user to input value of d i.e. float value
s = input() #prompts user to input value of s i.e. a string
print (s, d, k) #displays these variable values in reverse order
print (k, d, s)#displays these variable values in original order
In C++:
#include <iostream> // to use input output functions
using namespace std; //to identify objects like cin cout
int main() { //start of main function
int k; //declare int type variable to store an integer value
float d; // declare float type variable to store a float value
string s; // declare string type variable to store an integer value
cin >> k >> d >> s; //reads the value of k, d and s
cout << s << " " << d << " " << k << endl; //displays these variables values in reverse order
cout << k << " " << d << " " << s << endl; } // displays these variable values in original order
Explanation:
2nd question:
You would like the user of a program to enter a customer’s last name. Write a statement that asks user "Last Name:" and assigns input to a string variable called last_name.
Solution:
In Python:
last_name = input("Last Name:")
# input function is used to accept input from user and assign the input value to last_name variable
In C++:
string last_name; //declares a string type variable named last_name
cout<<"Last Name: "; // prompts user to enter last name by displaying this message Last Name:
cin>>last_name; // reads and assigns the input value to string variable last_name
The programs alongwith their outputs are attached.
