[Edit] C: Switch (#7155)

* [Edit] C: Switch

* Update switch.md

---------

Author: Sriparno08

content/c/concepts/switch/switch.md

@@ -1,52 +1,67 @@
 ---
-Title: 'Switch' # Required; the file name should be the same as the title, but lowercase, with dashes instead of spaces, and all punctuation removed
-Description: 'Evaluates several case conditions, and executes a code block if the case value is a match.' # Required; ideally under 150 characters and starts with a present-tense verb (used in search engine results and content previews)
-Subjects: # Please only use Subjects in the subjects.md file (https://github.com/Codecademy/docs/blob/main/documentation/subjects.md). If that list feels insufficient, feel free to create a new Subject and add it to subjects.md in your PR!
+Title: 'Switch'
+Description: 'Provides a structure for supporting several options or conditions to execute a block of code.'
+Subjects:
   - 'Code Foundations'
   - 'Computer Science'
-Tags: # Please only use Tags in the tags.md file (https://github.com/Codecademy/docs/blob/main/documentation/tags.md). If that list feels insufficient, feel free to create a new Tag and add it to tags.md in your PR!
+Tags:
   - 'Control Flow'
-  - 'If'
   - 'Else'
-CatalogContent: # Please use course/path landing page slugs, rather than linking to individual content items. If listing multiple items, please put the most relevant one first
+  - 'If'
+  - 'Switch'
+CatalogContent:
   - 'learn-c'
   - 'paths/computer-science'
 ---
 
-In C, the **`switch case`** statement provides a structure for supporting several options or conditions to execute a block of code, similar to the `if..else-if..else` statement. A main difference here, though, is that this statement is much easier to read and write.
-
-However, it can only evaluate one expression or variable at a time.
+In C, the **`switch`** statement provides a structure for supporting several options or conditions to execute a block of code. It provides a clean and effective alternative to lengthy `if-else` chains when checking a [variable](https://www.codecademy.com/resources/docs/c/variables) against multiple constant values. It is commonly used when a given variable's value must be compared against multiple possible options.
 
 ## Syntax
 
-```
+Here is the syntax for the `switch` statement (or the `switch` case):
+
+```pseudo
 switch(expression) {
   case value1:
     // Enter code here
     break;
   case value2:
     // Enter code here
     break;
-  case value_n:
+  case valueN:
     // Enter code here
     break;
   default:
     // Enter code here
 }
 ```
 
-Here's how the switch (aka switch-case) statement works:
+## How Switch Case Works
 
-1. The switch `expression` is evaluated only once.
-2. The value of the expression will be compared with the values of each `case`, and if there is a match the corresponding block of code is executed. If there is no code block provided in the `case`, the control moves on to the next `case` until it finds one with a code block, and executes the code block there.
-3. The `break` keyword breaks out of the switch block, and does not evaluate any additional statements in the switch. (Without the `break`, execution would continue with the next `case` statement.) The program now exits the switch.
-4. The code inside the `default` case is executed if none of the above cases are matched with the resulting value of the expression. This case is optional, and acts just like the `else` in an `if..else-if..else` statement. It serves as a "catch-all" case.
+Here's how the switch statement works:
 
-The expression or variable's resulting value must be of an integral or enumerated type. Examples of valid result types for switch-case expressions are `int`, `double`, `float`, and `char`. (Remember that characters, which have type `char`, are integral, because they have integer ASCII codes.) This statement will not be valid for expressions or variables that, for example, result in a string value.
+1. The `expression` is evaluated only once.
+2. The value of the expression will be compared with the values of each `case`, and if there is a match, the corresponding block of code is executed. If there is no code block provided in the `case`, the control moves on to the next `case` until it finds one with a code block, and executes the code block there.
+3. The `break` keyword breaks out of the `switch` block, and does not evaluate any additional statements in the `switch`. Without the `break`, execution would continue with the next `case` statement.
+4. The code inside the `default` case is executed if none of the above cases are matched with the resulting value of the expression. This case is optional, and acts just like the `else` in an `if-else` statement. It serves as a _catch-all_ case.
 
-## Example 1: Evaluating a variable
+The expression or variable's resulting value must be of an integral or [enumerated](https://www.codecademy.com/resources/docs/c/enums) type. Examples of valid result types for `switch` case expressions are `int`, `double`, `float`, and `char`. This statement will not be valid for expressions or variables that, for example, result in a string value.
 
-The following prints out some statements to a student based on a grade they got on a test or quiz.
+> **Note:** Remember that characters with type `char` are integral because they have integer ASCII codes.
+
+## Switch vs If-Else
+
+| **Feature**          | **`switch` Statement**              | **`if-else` Statement**                      |
+| -------------------- | ----------------------------------- | -------------------------------------------- |
+| Expression type      | Works with `int`, `char`, `enum`    | Supports all data types                      |
+| Readability          | Cleaner for multiple values         | Becomes lengthy with many conditions         |
+| Execution Speed      | Generally faster due to jump tables | Comparatively slower due to condition checks |
+| Range Checking       | Not suitable for ranges             | Suitable for conditions involving ranges     |
+| Fall-Through Allowed | Yes (if `break` is omitted)         | Not applicable                               |
+
+## Example 1: Evaluating a Variable
+
+This example prints out some statements to a student based on a grade they got on a test or quiz:
 
 ```c
 #include <stdio.h>
@@ -77,16 +92,16 @@ int main(){
 }
 ```
 
-This example will output:
+This code will output:
 
 ```shell
 Good job!
 Your grade is B
 ```
 
-## Example 2: Evaluating an expression
+## Example 2: Evaluating an Expression
 
-The following determines if the addition of two numbers results in either a total of 5 or 4.
+This example determines if the addition of two numbers results in either a total of `5` or `4`:
 
 ```c
 #include <stdio.h>
@@ -109,10 +124,32 @@ int main(){
 }
 ```
 
-This example will output:
+This code will output:
 
 ```shell
 The addition of 1 and 3 results in 4
 ```
 
-Just as aforementioned, a switch-case statement can be used to evaluate the value of not just a variable, but also an expression, as long as the expression results in one value that is either a number or something containing a numerical value.
+Just as aforementioned, a `switch` statement can be used to evaluate the value of not just a variable, but also an expression, as long as the expression results in one value that is either a number or something containing a numerical value.
+
+## Frequently Asked Questions
+
+### 1. Can we use strings in `switch` cases?
+
+No, C does not support `switch` with strings. It only works with `int`, `char`, and `enum` types.
+
+### 2. What happens if we forget to add `break` in `switch`?
+
+The control will _fall through_ to the next case and execute all subsequent cases until a `break` or end of `switch` is encountered.
+
+### 3. Is `default` necessary in a `switch` statement?
+
+No, `default` is optional in a `switch` statement. However, it is a good practice to include `default` to handle unexpected values.
+
+### 4. Can two cases in `switch` have the same value?
+
+No, case labels in `switch` must be unique. Duplicate case values will result in a compilation error.
+
+### 5. Can we nest `switch` statements?
+
+Yes, a `switch` can be nested inside another `switch`, though this can reduce code clarity and is rarely recommended.