Question

"Consider the following code which uses variables x, y, and z.

x <-- 3
y <-- 7
z <-- 21
x <-- y
y <-- z
DISPLAY (x)
DISPLAY (y)
Which of the following will be displayed after the code is run?
a) 3 7
b) 3 3
c) 21 21
d) 7 21"

Answer 1

d) 7 21", The code sets variables x, y, and z, then reassigns x to be y's value, and y to be z's value. The DISPLAY commands then show x as 7 and y as 21.

Step-by-step explanation:

The question involves understanding a sequence of variable assignments and outputs in a simple code. Initially, we have the following assignments for variables x, y, and z:

• x ← 3
• y ← 7
• z ← 21

The code then updates the values of x and y as follows:

• x ← y (now x equals 7)
• y ← z (now y equals 21)

After these updates, the DISPLAY commands will show the current values of x and y:

• DISPLAY(x) will show 7
• DISPLAY(y) will show 21

After running the code, the output will be: x = 7, y = 21. So, the correct option is d) 7 21.