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Chapter 3: Problem 25

What is the output of the following (when embedded in a complete program \() ?\) for \((\text { int count }=1 ; \text { count }<5 ; \text { count }++)\) cout \(<<(2 * \text { count })<<\) " ";

Short Answer

Expert verified
Answer: The output of the program is "2 4 6 8".

Step by step solution

01

Identify the structure of the for loop

The for loop in C++ is written as: for (initialization; condition; increment/decrement) { // code to be executed } In this exercise, the for loop is: for (int count = 1; count < 5; count++) { // code to be executed } The loop initializes the variable count with the integer value 1. In each iteration, the loop checks if the condition "count < 5" is true. If so, it runs the code within the loop. After the code execution, the "count" variable increments by 1 (++ operator). It will continue executing the loop until the condition is false.
02

Analyze the code within the loop

In the given code, the loop contains the following output command: cout << (2 * count) << " "; It multiplies the loop counter "count" with 2 and displays the result followed by a space. This process repeats in each iteration of the loop.
03

Calculate and list the outputs for each iteration

We'll now find the output for each iteration: 1. When count = 1: 2 * 1 = 2 2. When count = 2: 2 * 2 = 4 3. When count = 3: 2 * 3 = 6 4. When count = 4: 2 * 4 = 8
04

Combine the outputs

The final output is a sequence of numbers obtained from the loop, separated by spaces: 2 4 6 8

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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.

Does the following sequence produce division by zero? $$\begin{array}{l} j=-1 ; \\ \text { if }((j>0) \& \&(1 /(j+1)>10)) \\ \quad \text { cout }<<\quad i<<\text { end } 1 ; \end{array}$$

What output will be produced by the following code, when embedded in a complete program? \(\begin{aligned} \text {int extra} &=2 \\ \text {if }(\operatorname{extr} a&<0) \\ \text { cout }<<& \text { "small" } \\ \text { else if }(\text { extra }=& 0 \text { ) } \\ \text { cout }<<& \text { "medium" } \\ \text { e lse } & \text { cout }<<\text { "large"; } \end{aligned}\)

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

What is the output of the following (when embedded in a complete program \() ?\) for \((\text {double sample}=2 ; \text { sample }>0 ; \text { sample }=\text { sample }-0.5)\) cout \(<<\) sample \(<<"\) ";
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