Difference between revisions of "Rust/C2/Variables-and-Mutability-in-Rust/English"
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Author: Jayesh Katta Ramalingaiah | Author: Jayesh Katta Ramalingaiah | ||
− | Domain Reviewer: | + | Domain Reviewer: Vigneshwer Dhinakaran |
− | Novice Reviewer: Praveen S | + | Novice Reviewer: Praveen S. |
Keywords: Rust, cargo, package manager, variables, mut | Keywords: Rust, cargo, package manager, variables, mut |
Latest revision as of 11:18, 21 June 2021
Title of the script: Variables and Mutability
Author: Jayesh Katta Ramalingaiah
Domain Reviewer: Vigneshwer Dhinakaran
Novice Reviewer: Praveen S.
Keywords: Rust, cargo, package manager, variables, mut
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Slide: Title | Welcome to the spoken tutorial on “Variables and Mutability in RUST”. |
Slide:
Learning Objectives |
In this tutorial, we will learn:
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Slide: System Specifications | This tutorial is recorded using:
However you may use any other editor of your choice. |
Slide : Pre-requisites | To practice this tutorial,
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Slide: Code files |
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Slide: Mutability |
To understand this let us create a project and see how this works. |
Press Ctrl+Alt+T keys | Open the terminal by pressing Ctrl,Alt and T keys simultaneously on the keyboard.
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Only Narration | Here onwards, please remember to press the Enter key after typing each command. |
[Terminal] Type:
[Enter] |
Using cd command go to the Rust practice folder which we created earlier. |
[Terminal] Type:
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Let us create a new project named new variables_mutability.
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Open Visual Studio Code editor. | You may use any editor of your choice.
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[Editor]
Open Folder -> variables_mutability |
Open the created project by clicking on the Open folder link in the Welcome page.
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[Editor]
Click on variables_mutability |
Under EXPLORER section, expand the project “variables_mutability” by clicking on it. |
[Editor] Expand src and click on main.rs | Then expand the src and open the main.rs file. |
[Editor] Type:
let a = 1; print!(“The value of a is {}”,a); a=2; print!(“The value of a is {}”,a); } |
In the editor, replace the code as shown. |
[Editor]
Highlight: let |
let keyword is used to declare variables in Rust. |
[Editor] Highlight:
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Here we have initialized the variable a and assigned the value 1 to it. |
[Editor] Highlight:
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Using the println macro we are printing the value. |
[Editor] Highlight:
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Here the {} open and close braceis a format specifier. |
[Editor] Highlight:
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In the print method, the variable a is after comma.
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[Editor] Highlight:
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Here, we are trying to reassign the variable to 2. |
[Editor] Highlight:
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After reassigning we are printing the variable’s value to see what does the value contain. |
Ctrl + S | Save the file. |
Switch to terminal | Switch back to the terminal. |
[Terminal] Type:
[Enter] |
Go to the project folder variables_mutability using the cd command. |
[Terminal] Type:
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To compile the Cargo project, type cargo build. |
[Terminal] Highlight:
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Here, we can see an error - cannot assign twice to immutable variable ‘a’.
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Switch to Editor | So switch back to the editor. |
[Editor] Type:
let mut a = 1; |
Now, type m u t in between let and a.
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[Editor] Highlight:
let mut a = 1; |
Here we are telling the compiler that the initialized variable is mutable. |
Ctrl + S | Save the file. |
Switch to terminal | Switch back to the terminal. |
[Terminal] Type:
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Now type cargo run |
[Terminal] Highlight
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We can see the output.
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[Terminal] Highlight:
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After switching back, I directly did a cargo run without compiling the project again.
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Only narration | With this we have come to the end of this tutorial.
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Slide: Summary | In this tutorial, we have learnt:
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Slide: Assignment | As an assignment,
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Slide: About Spoken Tutorial Project |
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Slide: Spoken tutorial workshops |
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Slide: Forum questions | Pls post your timed queries in this forum |
Slide: Acknowledgement | Spoken Tutorial Project is funded by Ministry of Education, Government of India |
Slide: Thanks | This is Jayesh signing off. Thank you for joining |