Pure Programmer
Project: Chromatic Scale Frequencies
Compute the frequnecies of the notes in chromatic scale based on the standard piano keys in twelve-tone equal temperament. Print the note names A, A#, B, C, C#, etc. followed by the frequency in Hertz. One command line argument should be passed that indicates the octave on the piano that should be used, 0-7.
See [[Piano key frequencies]]
Output
$ rustc ChromaticScale.rs
error: format argument must be a string literal
--> ChromaticScale.rs:30:27
|
30 | println!("{}", format!(output_fmt, chromatic_scale[i], octave, frequency));
| ^^^^^^^^^^
|
help: you might be missing a string literal to format with
|
30 | println!("{}", format!("{} {} {} {}", output_fmt, chromatic_scale[i], octave, frequency));
| ++++++++++++++
error: format argument must be a string literal
--> ChromaticScale.rs:35:25
|
35 | println!("{}", format!(output_fmt, chromatic_scale[0], octave, frequency));
| ^^^^^^^^^^
|
help: you might be missing a string literal to format with
|
35 | println!("{}", format!("{} {} {} {}", output_fmt, chromatic_scale[0], octave, frequency));
| ++++++++++++++
error[E0425]: cannot find value `args` in this scope
--> ChromaticScale.rs:15:5
|
15 | if args.len() == 2 {
| ^^^^ not found in this scope
|
help: consider importing this function
|
7 + use std::env::args;
|
error[E0425]: cannot find value `Utils` in this scope
--> ChromaticScale.rs:16:12
|
16 | octave = Utils.stoiWithDefault(args[1], 0);
| ^^^^^ not found in this scope
error[E0425]: cannot find value `args` in this scope
--> ChromaticScale.rs:16:34
|
16 | octave = Utils.stoiWithDefault(args[1], 0);
| ^^^^ not found in this scope
|
help: consider importing this function
|
7 + use std::env::args;
|
error[E0425]: cannot find function `pow` in this scope
--> ChromaticScale.rs:19:22
|
19 | let half_step:f64 = pow(2.0f64,1.0f64 / 12.0f64);
| ^^^ not found in this scope
error[E0425]: cannot find function `pow` in this scope
--> ChromaticScale.rs:22:16
|
22 | frequency *= pow(2.0f64,(octave) as f64);
| ^^^ not found in this scope
error[E0277]: the type `[&'static str]` cannot be indexed by `isize`
--> ChromaticScale.rs:27:23
|
27 | if chromatic_scale[i].to_string() == "C".to_string() {
| ^ slice indices are of type `usize` or ranges of `usize`
|
= help: the trait `SliceIndex<[&'static str]>` is not implemented for `isize`
= help: the trait `SliceIndex<[T]>` is implemented for `usize`
= note: required for `Vec<&'static str>` to implement `Index<isize>`
error: aborting due to 8 previous errors
Some errors have detailed explanations: E0277, E0425.
For more information about an error, try `rustc --explain E0277`.
$ rustc ChromaticScale.rs
error: format argument must be a string literal
--> ChromaticScale.rs:30:27
|
30 | println!("{}", format!(output_fmt, chromatic_scale[i], octave, frequency));
| ^^^^^^^^^^
|
help: you might be missing a string literal to format with
|
30 | println!("{}", format!("{} {} {} {}", output_fmt, chromatic_scale[i], octave, frequency));
| ++++++++++++++
error: format argument must be a string literal
--> ChromaticScale.rs:35:25
|
35 | println!("{}", format!(output_fmt, chromatic_scale[0], octave, frequency));
| ^^^^^^^^^^
|
help: you might be missing a string literal to format with
|
35 | println!("{}", format!("{} {} {} {}", output_fmt, chromatic_scale[0], octave, frequency));
| ++++++++++++++
error[E0425]: cannot find value `args` in this scope
--> ChromaticScale.rs:15:5
|
15 | if args.len() == 2 {
| ^^^^ not found in this scope
|
help: consider importing this function
|
7 + use std::env::args;
|
error[E0425]: cannot find value `Utils` in this scope
--> ChromaticScale.rs:16:12
|
16 | octave = Utils.stoiWithDefault(args[1], 0);
| ^^^^^ not found in this scope
error[E0425]: cannot find value `args` in this scope
--> ChromaticScale.rs:16:34
|
16 | octave = Utils.stoiWithDefault(args[1], 0);
| ^^^^ not found in this scope
|
help: consider importing this function
|
7 + use std::env::args;
|
error[E0425]: cannot find function `pow` in this scope
--> ChromaticScale.rs:19:22
|
19 | let half_step:f64 = pow(2.0f64,1.0f64 / 12.0f64);
| ^^^ not found in this scope
error[E0425]: cannot find function `pow` in this scope
--> ChromaticScale.rs:22:16
|
22 | frequency *= pow(2.0f64,(octave) as f64);
| ^^^ not found in this scope
error[E0277]: the type `[&'static str]` cannot be indexed by `isize`
--> ChromaticScale.rs:27:23
|
27 | if chromatic_scale[i].to_string() == "C".to_string() {
| ^ slice indices are of type `usize` or ranges of `usize`
|
= help: the trait `SliceIndex<[&'static str]>` is not implemented for `isize`
= help: the trait `SliceIndex<[T]>` is implemented for `usize`
= note: required for `Vec<&'static str>` to implement `Index<isize>`
error: aborting due to 8 previous errors
Some errors have detailed explanations: E0277, E0425.
For more information about an error, try `rustc --explain E0277`.
$ rustc ChromaticScale.rs
error: format argument must be a string literal
--> ChromaticScale.rs:30:27
|
30 | println!("{}", format!(output_fmt, chromatic_scale[i], octave, frequency));
| ^^^^^^^^^^
|
help: you might be missing a string literal to format with
|
30 | println!("{}", format!("{} {} {} {}", output_fmt, chromatic_scale[i], octave, frequency));
| ++++++++++++++
error: format argument must be a string literal
--> ChromaticScale.rs:35:25
|
35 | println!("{}", format!(output_fmt, chromatic_scale[0], octave, frequency));
| ^^^^^^^^^^
|
help: you might be missing a string literal to format with
|
35 | println!("{}", format!("{} {} {} {}", output_fmt, chromatic_scale[0], octave, frequency));
| ++++++++++++++
error[E0425]: cannot find value `args` in this scope
--> ChromaticScale.rs:15:5
|
15 | if args.len() == 2 {
| ^^^^ not found in this scope
|
help: consider importing this function
|
7 + use std::env::args;
|
error[E0425]: cannot find value `Utils` in this scope
--> ChromaticScale.rs:16:12
|
16 | octave = Utils.stoiWithDefault(args[1], 0);
| ^^^^^ not found in this scope
error[E0425]: cannot find value `args` in this scope
--> ChromaticScale.rs:16:34
|
16 | octave = Utils.stoiWithDefault(args[1], 0);
| ^^^^ not found in this scope
|
help: consider importing this function
|
7 + use std::env::args;
|
error[E0425]: cannot find function `pow` in this scope
--> ChromaticScale.rs:19:22
|
19 | let half_step:f64 = pow(2.0f64,1.0f64 / 12.0f64);
| ^^^ not found in this scope
error[E0425]: cannot find function `pow` in this scope
--> ChromaticScale.rs:22:16
|
22 | frequency *= pow(2.0f64,(octave) as f64);
| ^^^ not found in this scope
error[E0277]: the type `[&'static str]` cannot be indexed by `isize`
--> ChromaticScale.rs:27:23
|
27 | if chromatic_scale[i].to_string() == "C".to_string() {
| ^ slice indices are of type `usize` or ranges of `usize`
|
= help: the trait `SliceIndex<[&'static str]>` is not implemented for `isize`
= help: the trait `SliceIndex<[T]>` is implemented for `usize`
= note: required for `Vec<&'static str>` to implement `Index<isize>`
error: aborting due to 8 previous errors
Some errors have detailed explanations: E0277, E0425.
For more information about an error, try `rustc --explain E0277`.