Answer:

a)  7904

b) Explanation:

• In Java, ‘\b’ is a character literal representing the backspace character.
• Its Unicode (ASCII) value is 8.
• In the expression x + ‘\b’:
  • x = 7896 (an int)
  • ‘\b’ = 8 (a char promoted to int)
  • So the calculation is: 7896 + 8 = 7904
• Hence, the output is 7904.
• The backspace effect is not seen because ‘\b’ is treated as a number in arithmetic, not as a string escape sequence.

c) Correct way to demonstrate backspace:
To actually see the backspace effect in console output, \b must be used inside a string:

public class BackspaceDemo {
public static void main(String[] args) {
System.out.println(“7896\b”);
}
}

Here, the \b moves the cursor back by one position, so the 6 gets erased and in this case answer will be 789