Iteration
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mod utils; use std::env; fn main() { let args: Vec<String> = env::args().collect(); let mut max:isize = 5; if args.len() == 2 { max = Utils.stoiWithDefault(args[1], 5); } { let mut i_:isize = 0; while i_ < max { println!("Hello, world!"); i_ += 1; } } }
Output
$ rustc Iteration1.rs
error[E0425]: cannot find value `Utils` in this scope
--> Iteration1.rs:8:9
|
8 | max = Utils.stoiWithDefault(args[1], 5);
| ^^^^^ not found in this scope
error: aborting due to previous error
For more information about this error, try `rustc --explain E0425`.
fn main() { { let mut i:isize = 10; while i >= 1 { println!("{}", i); i += -1; } } println!("Blastoff!"); }
Output
$ rustc Iteration2.rs
$ ./Iteration2
10
9
8
7
6
5
4
3
2
1
Blastoff!
fn main() { println!("Even numbers up to 100..."); { let mut i:isize = 2; while i <= 100 { println!("{}", i); i += 2; } } }
Output
$ rustc Iteration3.rs
$ ./Iteration3
Even numbers up to 100...
2
4
6
8
10
12
14
16
18
...
82
84
86
88
90
92
94
96
98
100
fn main() { println!("Floating point numbers"); { let mut d:f64 = 1.0f64; while d < 2.01f64 { println!("{}", d); d += 0.1f64; } } }
Output
$ rustc Iteration4.rs
$ ./Iteration4
Floating point numbers
1
1.1
1.2000000000000002
1.3000000000000003
1.4000000000000004
1.5000000000000004
1.6000000000000005
1.7000000000000006
1.8000000000000007
1.9000000000000008
2.000000000000001
fn main() { println!("Powers of 2 up to 256!"); { let mut i:isize = 1; while i <= 256 { println!("{}", i); i *= 2; } } }
Output
$ rustc Iteration5.rs
$ ./Iteration5
Powers of 2 up to 256!
1
2
4
8
16
32
64
128
256
fn main() { let mut s:&str = "Hello, world! 🥰🇺🇸"; for c in s.chars() { println!("{}", c); } }
Output
$ rustc Iteration6.rs
warning: variable does not need to be mutable
--> Iteration6.rs:2:6
|
2 | let mut s:&str = "Hello, world! 🥰🇺🇸";
| ----^
| |
| help: remove this `mut`
|
= note: `#[warn(unused_mut)]` on by default
warning: 1 warning emitted
$ ./Iteration6
H
e
l
l
o
,
w
o
r
l
d
!
🥰
🇺
🇸
Iterators
Questions
- {{Who's on first?}}
- {{Who's on second?}}
- {{Who's on third?}}
Projects
More ★'s indicate higher difficulty level.
- Amortization Table
- Amortization Table (Revisited)
- Blackboard
- Blackboard (Revisited)
- Character Types
- Compute π (Monte Carlo)
- Floating Point Error
- ISBN-10 Check
- License Plate Generator
- Multiplication Table
- Number Guessing Game
- Punchcard Message
- Random Floats
- Random Integers
- Supermarket Sale
- Supermarket Sale (Revisited)
- Temperature Table
- Unicode Test
References
- [[Rust Language Reference]]
- [[Rust Compiler]]