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Chapter 3: Problem 21

What is the output of the following (when embedded in a complete program \() ?\) int count \(=3\); while (count- - > 0) cout \(<<\) count \(<<\) " ";

Short Answer

Expert verified
Answer: The output is "3 2 1 ".

Step by step solution

01

Initialize the variable

Initialize the variable 'count' with the value 3.
02

Analyze the while loop condition

The while loop condition is (count-- > 0). The loop will continue running as long as the condition is true, meaning the 'count' value is greater than 0. The '--' is a post-decrement operator, which means the value of 'count' is decremented after it is compared with 0.
03

Analyze the loop body and output

Inside the while loop, we have a single statement: cout << count << " "; This statement will print the value of 'count' followed by a space.
04

Execute the loop and track the output

1. In the first iteration, 'count' has a value of 3. The loop condition checks if 3 > 0, which is true. Then the post-decrement operator decrements 'count' to 2. The output is "3 ". 2. In the second iteration, 'count' has a value of 2. The loop condition checks if 2 > 0, which is true. Then the post-decrement operator decrements 'count' to 1. The output is "3 2 ". 3. In the third iteration, 'count' has a value of 1. The loop condition checks if 1 > 0, which is true. Then the post-decrement operator decrements 'count' to 0. The output is "3 2 1 ". 4. In the fourth iteration, 'count' has a value of 0. The loop condition checks if 0 > 0, which is false. The loop stops executing.
05

Final output

The output of the given code snippet when embedded in a complete program is "3 2 1 ".

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Most popular questions from this chapter

For each of the following situations, tell which type of loop (while, dowhile, or for \()\) would work best: a. Summing a series, such as \(1 / 2+1 / 3+1 / 4+1 / 5+\ldots+1 / 10\) b. Reading in the list of exam scores for one student. c. Reading in the number of days of sick leave taken by employees in a department d. Testing a function to see how it performs for different values of its arguments.

What does it mean to trace a variable? How do you trace a variable?

What output will be produced by the following code, when embedded in a complete program? int first_choice \(=1\) switch (first_choice +1 ) \\{ case 1: cout \(<<\) "Roast beef \(\backslash n^{\prime \prime}\) break; case 2: cout \(<<\) "Roast worms \(\backslash \mathrm{n}^{\prime \prime}\) break; case 3: cout \(<<\) "Chocolate ice cream\backslashn"; case 4 cout \(<<\) "Onion ice cream \(\backslash \mathrm{n}^{\prime \prime}\) break; default: cout \(<<\) "Bon appetit! \(\backslash n "\)}

What output is produced by the following code, when embedded in a complete program? int number \(=22\) \\{ int number \(=42\) cout \(<<\) number \(<<" "\) 3 cout \(<<\) number;}

You have a fence that is to be 100 meters long. Your fence posts are to be placed every 10 feet. How many fence posts do you need? Why is the presence of this problem in a programming book not as silly as it might seem? What problem that programmers have does this question address?
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