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Chapter 5: Problem 49

T \(\mathrm{F}\) A variable may be defined in the initialization expression of the for loop.

Short Answer

Expert verified
Answer: A variable can be defined directly in the initialization expression of a for loop by including its type and initial value. For example: `for (int i = 1; i <= 10; i++)`. This practice limits the scope of the variable to the loop, making the code cleaner and preventing potential issues caused by variables with a larger scope.

Step by step solution

01

Introduction to for loop

A for loop is a programming construct that is used to repeat a block of code for a defined number of iterations. It consists of three main parts: the initialization expression, the condition, and the update expression. The initialization expression is executed only once, at the beginning. The condition is checked before each iteration, and the loop continues as long as the condition is true. The update expression is executed at the end of each iteration.
02

Defining a variable in the initialization expression

When declaring a for loop, it is possible to define a new variable within its initialization expression. The scope of this variable is limited to the loop's block of code, and it ceases to exist once the loop is finished. Defining a variable in the initialization expression is a good practice to keep the code organized and limit the variable's scope only to the for loop.
03

Example

Let's consider an example to illustrate how to define a variable in the initialization expression of a for loop. We want to calculate the sum of the first 10 natural numbers. ```cpp #include int main() { int sum = 0; // Defining the variable 'i' in the initialization expression of the for loop for (int i = 1; i <= 10; i++) { sum += i; } std::cout << "The sum of the first 10 natural numbers is: " << sum << std::endl; return 0; } ``` In this example, the variable 'i' is defined within the initialization expression of the for loop. It is assigned the value of 1 initially, and the loop continues until 'i' is less than or equal to 10. At each iteration, 'i' is incremented by 1 (using i++), and its value is added to the 'sum' variable. By defining the 'i' variable within the initialization expression, we limit its scope to the for loop and keep the code cleaner.

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Most popular questions from this chapter

Which loop should you use in situations where you wish the loop to repeat until the test expression is false, and the loop should not execute if the test expression is false to begin with?

Inside the for loop’s parentheses, the first expression is the __________ , the second expression is the __________ , and the third expression is the __________.

Convert the following for loop to a while loop: \\[ \begin{array}{l} \text { for }(\operatorname{int} x=50 ; x>0 ; x--) \\ \\{ \end{array} \\] cout \( < < x< < \) seconds to \(g \circ \cdot \ln "\) \\}

Why is it critical that accumulator variables be properly initialized?

Which loop should you use in situations where you wish the loop to repeat until the test expression is false, but the loop should execute at least one time?
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