Using a conditional expression, write a statement that increments numUsers if up

Question

Using a conditional expression, write a statement that increments numUsers if updateDirection is 1, otherwise decrements numUsers. Ex: if numUsers is 8 and updateDirection is 1, numUsers becomes 9; if updateDirection is 0, numUsers becomes 7. import java.util.Scanner; public class UpdateNumberOfUsers {4 public static void main (String [] args) {int numUsers = 0; int updateDirection = 0; numUsers = 8; updateDirection = 1; /* Your solution goes here */ System.out.println("New value is: " + numUsers); return;}}

Explanation / Answer

Source Code:

public class UpdateNumberOfUsers {
public static void main(String[] args) {
int numUsers = 0;
int updateDirection = 0;
  
numUsers = 8;
  
updateDirection = 1;
  
numUsers = (updateDirection == 1) ? numUsers + 1 : numUsers - 1;
  
System.out.println("New value is: " + numUsers);
  
return;
}
}

Description:

Here, you are required to write a conditional expression and as hint suggests, it starts with numUsers = ...

So, you are supposed to use the conditional operators here.

Then, the bold and underlined line is the line you need to insert in the code.

If updateDirection is 1 then you should increase numUsers by 1 otherwise decrease it by 1. So, this can be written in if-else statments as :

if(updateDirection == 1)

numUsers = numUsers + 1;

else

  numUsers = numUsers - 1;

So, to write this in the conditional expression, the if condition goes inside the ( ) . If it is true, perform the action written after ? and if it false, perform the operation written after :

So, the required line can be written as :   numUsers = (updateDirection == 1) ? numUsers + 1 : numUsers - 1;

If you execute the program after writing this line, you will get " New value is: 9 " in the output.

Please comment if there is any query. Thank you. :)

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