Again create a data file of random integers. Then write a program in C to implement the selection sort algorithm of Figure 3.6 using file input data. Write a separate function (method, procedure) to find the location of the largest number in the unsorted section of the list (see Figure 2.14) and have your main function call that as needed. Write your sorted list to another data file.
Again create a data file of random integers. Then write a program in C to implement the selection sort algorithm of Figure 3.6 using file input data. Write a separate function (method, procedure) to find the location of the largest number in the unsorted section of the list (see Figure 2.14) and have your main function call that as needed. Write your sorted list to another data file.
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Again create a data file of random integers. Then write a program in C to implement the selection sort
Transcribed Image Text:### Selection Sort Algorithm
**Figure 3.6**
1. Get values for \( n \) and the \( n \) list items.
2. Set the marker for the unsorted section at the end of the list.
3. While the unsorted section of the list is not empty, do steps 4 through 6:
4. Select the largest number in the unsorted section of the list.
5. Exchange this number with the last number in the unsorted section of the list.
6. Move the marker for the unsorted section left one position.
7. Stop.
---
### Selection Sort Algorithm Explanation
The selection sort algorithm is a basic sorting technique used to arrange elements in a list in ascending or descending order. It repeatedly finds the maximum (or minimum) element from the unsorted portion and places it at the end (or beginning) of the unsorted section. This process continues until the whole list is sorted.
Steps:
1. **Initialization**: Determine the number of elements \( n \) in the list.
2. **Setting Marker**: Position the marker at the end marker for what will begin as the unsorted portion and gradually shrink as elements are sorted.
3. **Iteration**: Continue the following steps until there are no more elements in the unsorted portion:
- **Selection**: Identify the largest element in the unsorted portion.
- **Exchange**: Swap this selected largest element with the element at the current end of the unsorted portion.
- **Move Marker**: Shift the marker one position to the left to update the boundary between the sorted and unsorted portions.
4. **Termination**: The algorithm completes when all elements have been sorted.
---
This explanation and pseudocode can be used to implement the selection sort algorithm in various programming languages. For a detailed understanding and practice, consider converting this algorithm into code using languages like Python, Java, or C++.
Transcribed Image Text:### Algorithm to Find the Largest Value in a List
#### Step-by-Step Procedure:
1. **Initialize Values:**
- Get a value for **n**, the size of the list.
- Get values for **A1, A2, ..., An**, the list to be searched.
2. **Initial Assignment:**
- Set the value of **largest_so_far** to **A1**.
- Set the value of **location** to **1**.
- Set the value of **i** to **2**.
3. **While Loop (Condition: i ≤ n):**
- If **Ai > largest_so_far**, then:
- Set **largest_so_far** to **Ai**.
- Set **location** to **i**.
- Add **1** to the value of **i**.
4. **End of Loop:**
- Print out the values of **largest_so_far** and **location**.
5. **Stop:**
- End the algorithm.
---
### Explanation of Figure 2.14
- The figure depicts an algorithm in a pseudo-code format that details the steps to find the largest value in a given list.
- The operations include initializing the list size and list values, setting an initial largest value, looping to compare each value in the list, and updating the largest value and its location accordingly.
This algorithm is commonly used in computer science to demonstrate basic loop operations and condition checks.
---
By following this algorithm, one can determine the largest value in a list and its position in an efficient manner.
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