Question

 Write a program to find the prime numbers

- Ask user to input the integer number

- test the number whether it is a prime number or not

- Then, print “true” or “false” depending on whether the number is prime or isn’t.

- Hint: number is prime when is has exactly 2 factors: one and itself. By this definition, number 1 is a special case and is NOT a prime.

- Use idea of user input, cumulative sum, and loop to solve this problem. You can assume user inputs positive number.

• Ask user to input two integer parameters a, and b.

– Assume that a is a positive integer (>0) and b is single-digit numbers from 0-9 inclusive.

– Your program should print:

• true if a contains b at among its digits, and

• false otherwise.

– For example when a is 3415, b is 1, should print true.

– (Note: You can not use a String to solve this problem. )

Answer 1

PROGRAMMING LANGUAGE - JAVA

PART 1

CODE -

import java.util.Scanner;

public class prime {

    public static void main(String[] args) {

        Scanner keyboard = new Scanner(System.in);

        // Initialize count of factors to 0

        int countFactors = 0;

        int num;

        // Take a number as input from user

        System.out.print("Enter a number: ");

        num = keyboard.nextInt();

        // Loop to count number of factors

        for(int i=1; i<=num; i++)

            // If the number is divisible by a number increase the count of factors

            if(num%i == 0)

                countFactors += 1;

        // Number is prime if number of factors is equal to 2

        if(countFactors == 2)

            System.out.println("True");

        else

            System.out.println("False");

        keyboard.close();

    }

}

SCREENSHOT -

PART 2

CODE -

import java.util.Scanner;

public class containDigit {

    public static void main(String[] args) {

        Scanner keyboard = new Scanner(System.in);

        int num, digit;

        // Take a positive number as input from the user

        System.out.print("Enter a positive integer: ");

        num = keyboard.nextInt();

        // Take a single-digit positive integer as input from user

        System.out.print("Enter a single-digit integer(0-9): ");

        digit = keyboard.nextInt();

        // Initialize contain variable to false

        boolean contain = false;

        // Loop to check if the number contain the entered number among its digit

        while(num>0)

        {

            int d = num%10;

            // Set the variable contain to true if the current digit of the number is equal to the second number(entered by user)

            if (digit == d)

            {

                contain = true;

                break;

            }

            num = num/10;

        }

        System.out.println(contain);

        keyboard.close();

    }

}

SCREENSHOT -

If you have any doubt regarding the solution or if you want the solution to be in a different programming language, then do comment.
Do upvote.