What is the value of r as a result of executing the code segment?
Understand the Problem
The question asks for the final value of the variable r after executing a series of assignments in the given code segment. We need to track the values assigned to each variable step by step.
Answer
The value of \( r \) is \( 20 \).
Answer for screen readers
The final value of ( r ) is ( 20 ).
Steps to Solve
-
Initial assignments
Assign the initial values to the variables.
[ p \leftarrow 10 \ q \leftarrow 20 \ r \leftarrow 30 \ s \leftarrow 40 ] -
First assignment operation
Replace the value of ( p ) with ( q ).
This means ( p ) now holds the value of ( q ), which is 20.
[ p \leftarrow q \Rightarrow p \leftarrow 20 ] -
Second assignment operation
Replace the value of ( q ) with ( r ).
Now ( q ) holds the value of ( r ), which is 30.
[ q \leftarrow r \Rightarrow q \leftarrow 30 ] -
Third assignment operation
Replace the value of ( s ) with ( q ).
Now ( s ) takes the value of ( q ), which is 30.
[ s \leftarrow q \Rightarrow s \leftarrow 30 ] -
Final assignment operation
Replace the value of ( r ) with ( p ).
The value of ( r ) is now taken from ( p ), which is 20.
[ r \leftarrow p \Rightarrow r \leftarrow 20 ]
The final value of ( r ) is ( 20 ).
More Information
The variable assignments follow a series of straightforward substitutions where each variable takes the value from another. Each step leads to the final value of ( r ).
Tips
- Overlooking previous assignments: Ensure to follow the changes in each step in order.
- Misreading variable values: Keep track of which variable holds what value after each assignment.
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