What is displayed as a result of executing the code segment?

Steps to Solve

1. Initial Variable Assignments
   Here are the initial values assigned to the variables:

   • $a = 10$
   • $b = 20$
   • $c = 30$
   • $d = 40$
   • $x = 20$

2. Updating Variable b
   We update $b$ by adding $x$ to it:

   • New value of $b$:
     $$ b = x + b = 20 + 20 = 40 $$

3. Updating Variable a
   Next, we update $a$ by adding $x$ and 1 to it:

   • New value of $a$:
     $$ a = x + 1 = 20 + 1 = 21 $$

4. Updating Variable d
   Now, we update $d$ by taking $c$ and adding half of $d$:

   • Calculation for the new value of $d$:
     $$ d = c + \frac{d}{2} = 30 + \frac{40}{2} = 30 + 20 = 50 $$

5. Final Values
   Now the variables have the following final values:

   • $a = 21$
   • $b = 40$
   • $c = 30$
   • $d = 50$

6. Display Output
   According to the code, we need to display the values in the following order:

   • DISPLAY $a$ = 21
   • DISPLAY $b$ = 40
   • DISPLAY $c$ = 30
   • DISPLAY $d$ = 50