Scenario: I am trying to create a recursion function that takes a number from the user. That number then goes through to equations where it squares the number and takes the square root of it. Then, that value is supposed to be sent back through the function, through the same equations. Then, I am trying to output the value of each iteration. The amount of iterations is a random number. This code is in C++ and I am using Visual Studio 2023. I have attached the code I, myself, typed and picture of the output. Also, this is a header file that is being called from my source.cpp file (case 5 in switch case). That is why I am entering 5 as the first input when I run the program. Problem: The output only shows one iteration of calculation, then goes straight back into taking an input from the user. What am I doing wrong?

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
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Scenario:

I am trying to create a recursion function that takes a number from the user. That number then goes through to equations where it squares the number and takes the square root of it. Then, that value is supposed to be sent back through the function, through the same equations. Then, I am trying to output the value of each iteration. The amount of iterations is a random number.

This code is in C++ and I am using Visual Studio 2023. I have attached the code I, myself, typed and picture of the output. Also, this is a header file that is being called from my source.cpp file (case 5 in switch case). That is why I am entering 5 as the first input when I run the program.

Problem:

The output only shows one iteration of calculation, then goes straight back into taking an input from the user. What am I doing wrong?

The image shows a C++ code snippet in Visual Studio. The code is part of a recursive function used to perform calculations on a user-input number. Below is the transcription and explanation of the code:

```cpp
#pragma once

using namespace std;

int loopNum;
int userNum;
double numPower;
double numSqrt;

int recursionFunction() {
    // User input of number to be calculated through two equations:
    cout << "Enter a number to calculate: ";
    cin >> userNum;

    // Loop Randomization:
    srand((unsigned)time(NULL));
    loopNum = rand() % 10 + 1;

    cout << "We will loop through both calculations " << loopNum << " times." << endl;

    if (loopNum > 0) {
        numPower = pow(userNum, 2);
        numSqrt = sqrt(userNum);

        cout << "\n" << numPower << endl;
        cout << numSqrt << endl;

        loopNum = loopNum - 1;

        return recursionFunction();
    } else
        return 0;
}
```

**Explanation:**

- **Header and Namespace:** 
  - `#pragma once` is used to ensure the file is included only once in the build process.
  - The `using namespace std;` line allows the use of standard library functions without the `std::` prefix.

- **Global Variables:** 
  - `loopNum`, `userNum` are integers used to store the number of loops and the user's input number, respectively.
  - `numPower`, `numSqrt` are doubles used to store the square and square root calculations.

- **Function `recursionFunction`:** 
  - Prompt the user to enter a number (`userNum`).
  - Randomize the number of loop iterations (`loopNum`) between 1 and 10.
  - Print the number of loop iterations.
  - If `loopNum` is greater than 0, calculate the square (`numPower`) and square root (`numSqrt`) of `userNum`.
  - Print the results, decrement `loopNum`, and recursively call `recursionFunction`.
  - If `loopNum` is 0, the function returns 0 ending the recursion.

The code performs calculations repeatedly based on a randomly determined loop count, highlighting the use of recursion and basic mathematical operations in C++.
Transcribed Image Text:The image shows a C++ code snippet in Visual Studio. The code is part of a recursive function used to perform calculations on a user-input number. Below is the transcription and explanation of the code: ```cpp #pragma once using namespace std; int loopNum; int userNum; double numPower; double numSqrt; int recursionFunction() { // User input of number to be calculated through two equations: cout << "Enter a number to calculate: "; cin >> userNum; // Loop Randomization: srand((unsigned)time(NULL)); loopNum = rand() % 10 + 1; cout << "We will loop through both calculations " << loopNum << " times." << endl; if (loopNum > 0) { numPower = pow(userNum, 2); numSqrt = sqrt(userNum); cout << "\n" << numPower << endl; cout << numSqrt << endl; loopNum = loopNum - 1; return recursionFunction(); } else return 0; } ``` **Explanation:** - **Header and Namespace:** - `#pragma once` is used to ensure the file is included only once in the build process. - The `using namespace std;` line allows the use of standard library functions without the `std::` prefix. - **Global Variables:** - `loopNum`, `userNum` are integers used to store the number of loops and the user's input number, respectively. - `numPower`, `numSqrt` are doubles used to store the square and square root calculations. - **Function `recursionFunction`:** - Prompt the user to enter a number (`userNum`). - Randomize the number of loop iterations (`loopNum`) between 1 and 10. - Print the number of loop iterations. - If `loopNum` is greater than 0, calculate the square (`numPower`) and square root (`numSqrt`) of `userNum`. - Print the results, decrement `loopNum`, and recursively call `recursionFunction`. - If `loopNum` is 0, the function returns 0 ending the recursion. The code performs calculations repeatedly based on a randomly determined loop count, highlighting the use of recursion and basic mathematical operations in C++.
**Title: Understanding Recursion and Random Calculations in C++**

**Code Breakdown:**

The code shown is written in C++ and explores the use of recursion and random calculations. The structure indicates that it is part of a project intended for educational purposes, likely in an academic setting. Below are key components of the code:

1. **Namespaces and Headers:**
   ```cpp
   using namespace std;
   #pragma once
   ```

2. **User Input and Loop:**
   - Prompts the user to enter a number between 0 and 6.
   - The program appears to attempt a calculation based on this input and performs a loop operation.
   ```cpp
   int loopNumber;
   cout << "Enter a number between 0 and 6 (including 0 or 6): ";
   ```

3. **Recursion Function:**
   - A recursive function is designed to calculate and provide a result related to loop operations.
   ```cpp
   int recursionFunction() {
       // Function code here
   }
   ```

**Console Output:**

- The console output indicates:
  ```
  Enter a number to calculate: 5
  numCalculations for loop 2: 9
  1.73205
  ```

This implies that for a given input of 5, calculations took place involving a loop from which \(1.73205\) was derived.

**Build Output:**

- The output section shows the build process:
  - An error occurred during the build due to file access issues: `fatal error LNK1168: cannot open... for writing`
  - The build result shows `0 succeeded, 1 failed`.

**Conclusion:**

This example demonstrates a C++ project aimed at implementing recursive functions and random number calculations. Error handling for failed builds could be improved, likely by checking file paths or permissions.

This project is useful for students learning C++ to understand recursion, user input handling, and debugging common build errors.
Transcribed Image Text:**Title: Understanding Recursion and Random Calculations in C++** **Code Breakdown:** The code shown is written in C++ and explores the use of recursion and random calculations. The structure indicates that it is part of a project intended for educational purposes, likely in an academic setting. Below are key components of the code: 1. **Namespaces and Headers:** ```cpp using namespace std; #pragma once ``` 2. **User Input and Loop:** - Prompts the user to enter a number between 0 and 6. - The program appears to attempt a calculation based on this input and performs a loop operation. ```cpp int loopNumber; cout << "Enter a number between 0 and 6 (including 0 or 6): "; ``` 3. **Recursion Function:** - A recursive function is designed to calculate and provide a result related to loop operations. ```cpp int recursionFunction() { // Function code here } ``` **Console Output:** - The console output indicates: ``` Enter a number to calculate: 5 numCalculations for loop 2: 9 1.73205 ``` This implies that for a given input of 5, calculations took place involving a loop from which \(1.73205\) was derived. **Build Output:** - The output section shows the build process: - An error occurred during the build due to file access issues: `fatal error LNK1168: cannot open... for writing` - The build result shows `0 succeeded, 1 failed`. **Conclusion:** This example demonstrates a C++ project aimed at implementing recursive functions and random number calculations. Error handling for failed builds could be improved, likely by checking file paths or permissions. This project is useful for students learning C++ to understand recursion, user input handling, and debugging common build errors.
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