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Java – If Conditional Statement Exercises

1) Write a Java program to test a number is positive or negative

import java.util.Scanner;
public class Resolve6_Exercise1 {

    
  public static void main(String[] args)
    {
        Scanner in = new Scanner(System.in);
        System.out.print("Input number: ");
        int input = in.nextInt();

        if (input > 0)
        {
            System.out.println("Number is positive");
        }
        else if (input < 0)
        {
            System.out.println("Number is negative");
        }
        else
        {
            System.out.println("Number is zero");
        }
    }
}

2) Take three numbers from the user and print the greatest number

import java.util.Scanner;
public class Resolve6_Exercise2 {

    
  public static void main(String[] args) {
  Scanner in = new Scanner(System.in);
   
  System.out.print("Input the 1st number: ");
  int num1 = in.nextInt();
   
  System.out.print("Input the 2nd number: ");
  int num2 = in.nextInt();
   
  System.out.print("Input the 3rd number: ");
  int num3 = in.nextInt();
   
   
  if (num1 > num2)
   if (num1 > num3)
    System.out.println("The greatest: " + num1);
   
  if (num2 > num1)
   if (num2 > num3)
    System.out.println("The greatest: " + num2);
   
  if (num3 > num1)
   if (num3 > num2)
    System.out.println("The greatest: " + num3);
 }
}

3) Write a Java Program to produce an invoice for the below items

– Carrots: $2 / lb
– Onions – $4 / lb
– Meat – $10 / lb

a) Ask the customer to how many lbs do they need, and calculate the total
b) Ask the customer if they want to pay cash or card
– If Card, add 13% HST to total
– if Cash, don’t add Tax
c) Display the total amount that customer needs to pay


import java.util.Scanner;

public class Resolve6_Excercise3{

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		
		Scanner input = new Scanner(System.in);
		
		System.out.print("Did you complete this assignment ? ");
				String response = input.next();
				
		if (response.equals("yes")){
			System.out.println("Excellent!, You can check your code here on Sunday");
			} else if(response.equals("no")) {
				System.out.println("No Problem!, Get it done now! ");
			} else {
				System.out.println("I guess, you did not read the question properly!! ");
			}
	}

}