/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 16 16\. In the following program se... [FREE SOLUTION] | 91Ó°ÊÓ

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16\. In the following program segment \(i, j, m\), and \(n\) are integer variables. The values of \(m\) and \(n\) are supplied by the user earlier in the execution of the total program. for \(i:=1\) to \(m\) do for \(j:=1\) to \(n\) do if \(i \neq j\) then print \(i+j\) How many times is the print statement in the segment executed when (a) \(m=10, n=10 ;\) (b) \(m=20, n=20 ;\) (c) \(m=\) \(10, n=20\); (d) \(m=20, n=10 ?\)

Short Answer

Expert verified
(a) 90 times, (b) 380 times, (c) 190 times, (d) 190 times

Step by step solution

01

Understand the loops

Initially, it's necessary to understand the nature of the nested for-loops. The outer loop runs from 1 to m (inclusive), and for each iteration of the outer loop, the inner loop runs from 1 to n (inclusive). So, in the absence of any conditional statement, the 'print' command would execute m*n times.
02

Apply the condition

However, the print statement is under the 'if' condition \(i \neq j\). This means it won't be executed when i equals j. Since both i and j run from 1 to m and n respectively, there will be min(m,n) instances when i equals j, as they will be equal when both are 1, both are 2, and so on, up to both being min(m,n).
03

Compute the number of print operations

Therefore, the number of times the print statement is executed is equal to the total number of loop iterations (which is m*n from Step 1) subtracted by the overlapping (i equal to j) instances calculated in Step 2. That is, the answer is m*n - min(m,n).
04

Apply the values from the question

Now, apply this logic to all the given pairs of m,n: (a) m=10, n=10, (b) m=20, n=20, (c) m=10, n=20, (d) m=20, n=10. Plug these values into the formula obtained from Step 3.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Nested Loops
Nested loops are an essential concept in programming where one loop is placed inside another. In the provided exercise, there are two loops: an outer loop that runs from 1 to \(m\), and an inner loop that iterates from 1 to \(n\). This means that for each single iteration of the outer loop, the inner loop completes its entire cycle. Hence, the total number of iterations for both loops combined, if there were no conditions, would be \(m \times n\). This structure allows programmers to perform repeated actions on multidimensional datasets, such as matrices. It is important to visualize nested loops as concentric cycles, where the inner loop completes its full cycle for every step of the outer loop.
Conditional Statements
Conditional statements provide a mechanism to control the flow of a program based on certain conditions. In our exercise, there is an 'if' statement: \(i eq j\). This condition ensures that the print operation inside the nested loops only occurs when the values of \(i\) and \(j\) are different. Without this condition, every iteration of the loop would execute the print statement. The key aspect here is that a conditional statement evaluates a Boolean expression (true or false) to decide which block of code should be executed. This feature allows programmers to make decisions within their code, providing flexibility and power to handle different scenarios.
Algorithm Analysis
Algorithm analysis is the study of how algorithms perform regarding resources used, often focused on time (speed) and space (memory) complexity. In this exercise, analyzing the algorithm involves determining how many times the print statement executes, which is directly influenced by both loop iterations and the conditional statement. By calculating \(m \times n - \min(m, n)\), we effectively quantify the operations carried out by our nested loop structure, excluding instances where \(i = j\). This type of analysis helps in understanding the efficiency of an algorithm, enabling optimizations to reduce computational resources while achieving the desired output.
Loop Iterations
Understanding loop iterations is crucial for effectively using loops in programming. In this exercise, each iteration represents a single cycle of a loop where a particular set of instructions is executed. The outer loop iterates \(m\) times, and for every such iteration, the inner loop iterates \(n\) times. Thus, without any conditions, the total number of iterations would be \(m \times n\). However, the exercise involves a conditional check \(i eq j\) which modifies how often the print statement is executed. Therefore, the actual number of executions becomes \(m \times n - \min(m, n)\) due to the condition restricting some iterations (i.e., where \(i = j\)). Understanding these concepts directly impacts one's ability to predict and optimize the behavior of loops in code.

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Most popular questions from this chapter

1\. Determine whether each of the following sentences is a statement. a) In 2003 George W. Bush was the president of the United States, b) \(x+3\) is a positive integer. c) Fifteen is an even number. d) If Jennifer is late for the party, then her cousin Zachary will be quite angry. e) What time is it? f) As of June 30,2003 , Christine Marie Evert had won the French Open a record seven times.

7\. a) If \(p, q\) are primitive statements, prove that $$ (\neg p \vee q) \wedge(p \wedge(p \wedge q)) \Leftrightarrow(p \wedge q) $$ b) Write the dual of the logical equivalence in part (a).

14\. Prove that for every integer \(n\), if \(n\) is odd, then \(n^{2}\) is odd.

18\. Give the reasons for each step in the following simplifications of compound statements. a) $$ \begin{aligned} &[(p \vee q) \wedge(p \vee \neg q)] \vee q \quad \text { Reasons } \\ & \Leftrightarrow[p \vee(q \wedge \neg q)] \vee q \\ \Leftrightarrow &\left(p \vee F_{0}\right) \vee q \\ \Leftrightarrow & p \vee q \end{aligned} $$

13\. Suppose that \(p(x, y)\) is an open statement where the universe for each of \(x, y\) consists of only three integers: \(2,3,5\). Then the quantified statement \existsy \(p(2, y)\) is logically equivalent to \(p(2,2) \vee p(2,3) \vee p(2,5)\). The quantified statement \(\exists x \forall y p(x, y)\) is logically equivalent to \([p(2,2) \wedge p(2,3) \wedge\) \(p(2,5)] \vee[p(3,2) \wedge p(3,3) \wedge p(3,5)] \vee[p(5,2) \wedge p(5,3)\) \(\wedge p(5,5)]\). Use conjunctions and/or disjunctions to express the following statements without quantifiers. a) \(\forall x p(x, 3)\) b) \(\exists x \exists y p(x, y)\) c) \(\forall y \exists x p(x, y)\)

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