Question

WRITE A PROGRAM to Input a number and print the sum of the even digits and product of odd digits according to users choice in java.​

Answer 1

Answer:

import java util.Scanner;

public class abc

{

public static void main(String args[ ])

{

Scanner scan=new Scanner(System.in)

System.out println( "1) Sum of even");

System.out println( "2) Product of odd");

System.out println(" Enter choice ");

int ch= scan.nextInt();

System.out println( "Enter number");

int num=scan.nextInt()

int sum=0;

int p=1;

int d,d1;

switch(ch)

{

case 1: for(; n!=0;n/=10)

{

d= n%10;

if (d%2==0)

sum+=d;

}

System.out.println(sum);

break;

case 2: for(; n!=0;n/=10)

{

d1= n%10;

if (d%2!=0)

p*=d;

}

System.out.println(p);

break;

default: System.out.println("Wrong choice entered");

}

}

}

Explanation:

• Using scanner class for input
• Creating class
• Since we are using switch case, inputting the choice of the user and the number
• declaring the sum and product variables with 0 and 1 respectively to avoid an error
• extracting digits
• if the extrated digit is even/odd in the cases it is added or multiplied respectively with the no. pre existing in the variable
• then it is printed
• break keyword is used to avoid fall through through the cases (to allow one specific chosen case to be executed)
• Deafult is not necessary to use but it is considered a good way to make a default case if by mistake the user has entered the wrong value/choice