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2021-10-05
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Oct 6 In-Class Exercise Thread.

Please post your solutions to the Oct 6 In-Class Exercise to this thread.
Best,
Chris
Please post your solutions to the Oct 6 In-Class Exercise to this thread. Best, Chris
2021-10-06
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-- Oct 6 In-Class Exercise Thread
Unmodified Program: fn main() { let s1 = String::from("hi there"); let s2 = s1.clone(); println!("s1 = {}, s2 = {}", s1, s2); }
Output: s1 = hi there, s2 = hi there
Modified Program: fn main() { let s1 = String::from("hi there"); let s2 = s1; println!("s1 = {}, s2 = {}", s1, s2); }
Output: error[E0382]: borrow of moved value: `s1` --> main.rs:4:31 | 2 | let s1 = String::from("hi there"); | -- move occurs because `s1` has type `std::string::String`, which does not implement the `Copy` trait 3 | let s2 = s1; // if had let s2 = s1; instead, next line w... | -- value moved here 4 | println!("s1 = {}, s2 = {}", s1, s2); | ^^ value borrowed here after move error: aborting due to previous error For more information about this error, try `rustc --explain E0382`. exit status 1
Unmodified Program: <nowiki> fn main() { let s1 = String::from("hi there"); let s2 = s1.clone(); println!("s1 = {}, s2 = {}", s1, s2); } </nowiki> Output: <nowiki> s1 = hi there, s2 = hi there </nowiki> Modified Program: <nowiki> fn main() { let s1 = String::from("hi there"); let s2 = s1; println!("s1 = {}, s2 = {}", s1, s2); } </nowiki> Output: <nowiki> error[E0382]: borrow of moved value: @BT@s1@BT@ --> main.rs:4:31 | 2 | let s1 = String::from("hi there"); | -- move occurs because @BT@s1@BT@ has type @BT@std::string::String@BT@, which does not implement the @BT@Copy@BT@ trait 3 | let s2 = s1; // if had let s2 = s1; instead, next line w... | -- value moved here 4 | println!("s1 = {}, s2 = {}", s1, s2); | ^^ value borrowed here after move error: aborting due to previous error For more information about this error, try @BT@rustc --explain E0382@BT@. exit status 1 </nowiki>
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-- Oct 6 In-Class Exercise Thread
fn main(){
	let s1 = String::from("hi there");
	let s2 = s1.clone(); // if had let s2 = s1; instead, next line would not work
	println!("s1 = {}, s2 = {}", s1, s2);
} fn main(){
	let s1 = String::from("hi there");
	let s2 = s1; // if had let s2 = s1; instead, next line would not work
	println!("s1 = {}, s2 = {}", s1, s2);
} Resource Description for Screen Shot 2021-10-06 at 6.05.40 PM.png
fn main(){ let s1 = String::from("hi there"); let s2 = s1.clone(); // if had let s2 = s1; instead, next line would not work println!("s1 = {}, s2 = {}", s1, s2); } fn main(){ let s1 = String::from("hi there"); let s2 = s1; // if had let s2 = s1; instead, next line would not work println!("s1 = {}, s2 = {}", s1, s2); } ((resource:Screen Shot 2021-10-06 at 6.05.40 PM.png|Resource Description for Screen Shot 2021-10-06 at 6.05.40 PM.png))
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-- Oct 6 In-Class Exercise Thread
 fn main() {
  let s1 = String::from("hi there");
  let s2 = s1.clone(); // if had let s2 = s1; instead, next line would not work
  println!("s1 = {}, s2 = {}", s1, s2);
 }
 
 output:
 s1 = hi there, s2 = hi there
 
 fn main() {
  let s1 = String::from("hi there");
  let s2 = s1; // if had let s2 = s1; instead, next line would not work
  println!("s1 = {}, s2 = {}", s1, s2);
 }
 
 output: 
 error[E0382]: borrow of moved value: `s1`
  --> src/main.rs:4:30
   |
 2 | let s1 = String::from("hi there");
   |     -- move occurs because `s1` has type `String`, which does not implement the 
 `Copy` trait
 3 | let s2 = s1; // if had let s2 = s1; instead, next line would not work
   |          -- value moved here
 4 | println!("s1 = {}, s2 = {}", s1, s2);
   |                              ^^ value borrowed here after move
For more information about this error, try `rustc --explain E0382`. error: could not compile `playground` due to previous error
fn main() { let s1 = String::from("hi there"); let s2 = s1.clone(); // if had let s2 = s1; instead, next line would not work println!("s1 = {}, s2 = {}", s1, s2); } output: s1 = hi there, s2 = hi there fn main() { let s1 = String::from("hi there"); let s2 = s1; // if had let s2 = s1; instead, next line would not work println!("s1 = {}, s2 = {}", s1, s2); } output: error[E0382]: borrow of moved value: @BT@s1@BT@ --> src/main.rs:4:30 | 2 | let s1 = String::from("hi there"); | -- move occurs because @BT@s1@BT@ has type @BT@String@BT@, which does not implement the @BT@Copy@BT@ trait 3 | let s2 = s1; // if had let s2 = s1; instead, next line would not work | -- value moved here 4 | println!("s1 = {}, s2 = {}", s1, s2); | ^^ value borrowed here after move For more information about this error, try @BT@rustc --explain E0382@BT@. error: could not compile @BT@playground@BT@ due to previous error
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-- Oct 6 In-Class Exercise Thread
Last example's output: 
 s1 = hi there, s2 = hi there
Switch s2=s1.clone() and s2=s1 output: 
  Compiling playground v0.0.1 (/playground)
 error[E0382]: borrow of moved value: `s1`
  --> src/main.rs:5:34
   |
 3 |     let s1 = String::from("hi there");
   |         -- move occurs because `s1` has type `String`, which does not implement the `Copy` trait
 4 |     let s2=s1; // if had let s2 = s1; instead, next line would not work
   |            -- value moved here
 5 |     println!("s1 = {}, s2 = {}", s1, s2);
   |                                  ^^ value borrowed here after move
 
 For more information about this error, try `rustc --explain E0382`.
 error: could not compile `playground` due to previous error
''' Last example's output:''' s1 = hi there, s2 = hi there ''' Switch s2=s1.clone() and s2=s1 output:''' Compiling playground v0.0.1 (/playground) error[E0382]: borrow of moved value: @BT@s1@BT@ --> src/main.rs:5:34 | 3 | let s1 = String::from("hi there"); | -- move occurs because @BT@s1@BT@ has type @BT@String@BT@, which does not implement the @BT@Copy@BT@ trait 4 | let s2=s1; // if had let s2 = s1; instead, next line would not work | -- value moved here 5 | println!("s1 = {}, s2 = {}", s1, s2); | ^^ value borrowed here after move For more information about this error, try @BT@rustc --explain E0382@BT@. error: could not compile @BT@playground@BT@ due to previous error
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-- Oct 6 In-Class Exercise Thread
Original: fn main(){ let s1 = String::from("hi there"); let s2 = s1.clone(); // if had let s2 = s1; instead, next line would not work println!("s1 = {}, s2 = {}", s1, s2); } Output: s1 = hi there, s2 = hi there Modified: fn main(){ let s1 = String::from("hi there"); s2 = s1; println!("s1 = {}, s2 = {}", s1, s2); } Output: error[E0425]: cannot find value `s2` in this scope --> test.rs:3:5 | 3 | s2 = s1; | ^^ help: a local variable with a similar name exists: `s1` error[E0425]: cannot find value `s2` in this scope --> test.rs:4:38 | 4 | println!("s1 = {}, s2 = {}", s1, s2); | ^^ help: a local variable with a similar name exists: `s1` error: aborting due to 2 previous errors
<nowiki> Original: fn main(){ let s1 = String::from("hi there"); let s2 = s1.clone(); // if had let s2 = s1; instead, next line would not work println!("s1 = {}, s2 = {}", s1, s2); } Output: s1 = hi there, s2 = hi there Modified: fn main(){ let s1 = String::from("hi there"); s2 = s1; println!("s1 = {}, s2 = {}", s1, s2); } Output: error[E0425]: cannot find value @BT@s2@BT@ in this scope --> test.rs:3:5 | 3 | s2 = s1; | ^^ help: a local variable with a similar name exists: @BT@s1@BT@ error[E0425]: cannot find value @BT@s2@BT@ in this scope --> test.rs:4:38 | 4 | println!("s1 = {}, s2 = {}", s1, s2); | ^^ help: a local variable with a similar name exists: @BT@s1@BT@ error: aborting due to 2 previous errors </nowiki>
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-- Oct 6 In-Class Exercise Thread
fn main() {
    let s1 = String::from("hi there");
    let s2 = s1.clone(); // if had let s2 = s1; instead, next line would not work
    println!("s1 = {}, s2 = {}", s1, s2);
}
Output: s1 = hi there, s2 = hi there
Modified:
fn main() {
    let s1 = String::from("hi there");
    let s2 = s1; 
    println!("s1 = {}, s2 = {}", s1, s2);
}
Output: error[E0382]: borrow of moved value: `s1`
 --> src/main.rs:4:34
  |
2 | let s1 = String::from("hi there");
  |         -- move occurs because `s1` has type `String`, which does not implement the `Copy` trait
3 | let s2 = s1; // if had let s2 = s1; instead, next line would not work
  |              -- value moved here
4 | println!("s1 = {}, s2 = {}", s1, s2);
  |                                  ^^ value borrowed here after move
For more information about this error, try `rustc --explain E0382`.
(Edited: 2021-10-06)
fn main() { let s1 = String::from("hi there"); let s2 = s1.clone(); // if had let s2 = s1; instead, next line would not work println!("s1 = {}, s2 = {}", s1, s2); } Output: s1 = hi there, s2 = hi there Modified: fn main() { let s1 = String::from("hi there"); let s2 = s1; println!("s1 = {}, s2 = {}", s1, s2); } Output: error[E0382]: borrow of moved value: @BT@s1@BT@ --> src/main.rs:4:34 | 2 | let s1 = String::from("hi there"); | -- move occurs because @BT@s1@BT@ has type @BT@String@BT@, which does not implement the @BT@Copy@BT@ trait 3 | let s2 = s1; // if had let s2 = s1; instead, next line would not work | -- value moved here 4 | println!("s1 = {}, s2 = {}", s1, s2); | ^^ value borrowed here after move For more information about this error, try @BT@rustc --explain E0382@BT@.
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-- Oct 6 In-Class Exercise Thread
thanhle@Thanhs-MacBook-Pro hw2_thanh % rustc main.rs thanhle@Thanhs-MacBook-Pro hw2_thanh % ./main s1 = hi there
 s2 = hi there
thanhle@Thanhs-MacBook-Pro hw2_thanh % rustc main2.rs error[E0382]: borrow of moved value: `s1`
 --> main2.rs:5:31
  |
2 | let s1 = String::from("Hello");
  |         -- move occurs because `s1` has type `String`, which does not implement the `Copy` trait
3 | let s2 = s1;
  |              -- value moved here
4 | 5 | println!("s1 = {}, s2 = {}", s1, s2);
  |                                  ^^ value borrowed here after move
error: aborting due to previous error
For more information about this error, try `rustc --explain E0382`. thanhle@Thanhs-MacBook-Pro hw2_thanh %
fn main() {
	let s1 = String::from("hi there\n");
	let s2 = s1.clone(); // if had let s2 = s1; instead, next line would not work

	println!("s1 = {} s2 = {}", s1, s2);
} fn main() {
	let s1 = String::from("Hello");
	let s2 = s1;

	println!("s1 = {}, s2 = {}", s1, s2);
}
(Edited: 2021-10-06)
thanhle@Thanhs-MacBook-Pro hw2_thanh % rustc main.rs thanhle@Thanhs-MacBook-Pro hw2_thanh % ./main s1 = hi there s2 = hi there thanhle@Thanhs-MacBook-Pro hw2_thanh % rustc main2.rs error[E0382]: borrow of moved value: @BT@s1@BT@ --> main2.rs:5:31 | 2 | let s1 = String::from("Hello"); | -- move occurs because @BT@s1@BT@ has type @BT@String@BT@, which does not implement the @BT@Copy@BT@ trait 3 | let s2 = s1; | -- value moved here 4 | 5 | println!("s1 = {}, s2 = {}", s1, s2); | ^^ value borrowed here after move error: aborting due to previous error For more information about this error, try @BT@rustc --explain E0382@BT@. thanhle@Thanhs-MacBook-Pro hw2_thanh % fn main() { let s1 = String::from("hi there\n"); let s2 = s1.clone(); // if had let s2 = s1; instead, next line would not work println!("s1 = {} s2 = {}", s1, s2); } fn main() { let s1 = String::from("Hello"); let s2 = s1; println!("s1 = {}, s2 = {}", s1, s2); }
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-- Oct 6 In-Class Exercise Thread
fn main() {
    let x = 20;
    let y = x;
    
    let s1 = String::from("hi there");
    // let s2= s1;
    
    let s2 = s1.clone();
    println!("s1 = {}, s2={}",s1,s2);
}
Output: s1 = hi there, s2=hi there
fn main() {
    let x = 20;
    let y = x;
    
    let s1 = String::from("hi there");
    let s2= s1;
    
    // let s2 = s1.clone();
    println!("s1 = {}, s2={}",s1,s2);
}
Output: error[E0382]: borrow of moved value: `s1`
fn main() { let x = 20; let y = x; let s1 = String::from("hi there"); // let s2= s1; let s2 = s1.clone(); println!("s1 = {}, s2={}",s1,s2); } Output: s1 = hi there, s2=hi there fn main() { let x = 20; let y = x; let s1 = String::from("hi there"); let s2= s1; // let s2 = s1.clone(); println!("s1 = {}, s2={}",s1,s2); } Output: error[E0382]: borrow of moved value: @BT@s1@BT@
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-- Oct 6 In-Class Exercise Thread
Code:
fn main(){
	let s1 = String::from("hi there");
	let s2 = s1.clone(); // if had let s2 = s1; instead, next line would not work
	println!("s1 = {}, s2 = {}", s1, s2);
} Output:s1 = hi there, s2 = hi there    Modified code error[E0382]: borrow of moved value: `s1`  --> inclass.rs:4:31   | 2 |     let s1 = String::from("hi there");   |         -- move occurs because `s1` has type `String`, which does not implem ent the `Copy` trait 3 |     let s2 = s1; // if had let s2 = s1; instead, next line would not work   |              -- value moved here 4 |     println!("s1 = {}, s2 = {}", s1, s2);   |                                  ^^ value borrowed here after move    error: aborting due to previous error    For more information about this error, try `rustc --explain E0382`. (Edited: 2021-10-06)
<pre> Code: fn main(){ let s1 = String::from("hi there"); let s2 = s1.clone(); // if had let s2 = s1; instead, next line would not work println!("s1 = {}, s2 = {}", s1, s2); } Output:s1 = hi there, s2 = hi there Modified code error[E0382]: borrow of moved value: @BT@s1@BT@ --> inclass.rs:4:31 | 2 | let s1 = String::from("hi there"); | -- move occurs because @BT@s1@BT@ has type @BT@String@BT@, which does not implem ent the @BT@Copy@BT@ trait 3 | let s2 = s1; // if had let s2 = s1; instead, next line would not work | -- value moved here 4 | println!("s1 = {}, s2 = {}", s1, s2); | ^^ value borrowed here after move error: aborting due to previous error For more information about this error, try @BT@rustc --explain E0382@BT@. </pre>
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