Question

Write a program that does the following:  Assume the canvas size of 500X500.  The program asks the user to enter a 3 digit number.  The program then checks the value of the first and last digit of the number.  If the first and last digits are even, it makes the background green and displays the three digit number at the mouse pointer.  If the two digits are odd, it makes the background red and displays the three digit number at the mouse pointer.  If the first digit is odd and the third is even, it makes the background blue and display the three digit number at the mouse pointer.  The number entered by the user is displayed at the mouse pointer at all times irrespective of the location of the mouse pointer. Hint: import javax.swing.JOptionPane; JOptionPane.showInputDialog("")

please help me solve this using processing java pde

Answer 1

Working code implemented in Java PDE and appropriate comments provided for better understanding.

main.pde:

import javax.swing.JOptionPane;

int number;
color c;

void setup(){
  size(500,500);
  //asking, reading number
  number=Integer.parseInt(JOptionPane.showInputDialog("Enter a three digit number: "));
  //assuming user will always enter a valid three digit number
  //fetching first digit by integer division of number by 100
  int first=number/100;
  //fetching last digit by modulo division by 10
  int last=number%10;
  
  //if first and last digits are even, assigning green color to c
  if(first%2==0 && last%2==0){
    c=color(0,255,0);
  }
  //if first and last digits are odd, assigning red color to c
  else if(first%2!=0 && last%2!=0){
    c=color(255,0,0);
  }
  //if first digit is odd and last digits is even, assigning blue color to c
  else if(first%2!=0 && last%2==0){
    c=color(0,0,255);
  }
  //there is still one more case which is not mentioned in the question, that is
  //if first digit is even and second is odd, since not specified any other, I'm 
  //using a default gray color
  else{
    c=color(200,200,200);
  }
}



void draw(){
  //using c as background color
  background(c);
  //using black fill color
  fill(0);
  //drawing number at mouse position
  text(""+number,mouseX,mouseY);
  
}

Sample Output Screenshots: