Pure Programmer
Project: Quadratic Roots (Command Line)
Quadratic equations of the form Ax2 + Bx + C = 0 have two possible solutions given by the [[Quadratic Formula]]. Write a program that prints the two possible roots of a quadratic equation. Then values A, B and C should be passed in on the command line.
See: QuadraticRoots
Output
$ rustc QuadraticRootsCmdLine.rs
error: unknown format trait `s`
--> QuadraticRootsCmdLine.rs:12:38
|
12 | println!("{}", format!("Syntax: {0:s} a b c", utils::program_name().expect("program name should not be empty!")));
| ^
|
= note: the only appropriate formatting traits are:
- ``, which uses the `Display` trait
- `?`, which uses the `Debug` trait
- `e`, which uses the `LowerExp` trait
- `E`, which uses the `UpperExp` trait
- `o`, which uses the `Octal` trait
- `p`, which uses the `Pointer` trait
- `b`, which uses the `Binary` trait
- `x`, which uses the `LowerHex` trait
- `X`, which uses the `UpperHex` trait
error[E0425]: cannot find value `args` in this scope
--> QuadraticRootsCmdLine.rs:11:5
|
11 | if args.len() != 4 {
| ^^^^ not found in this scope
|
help: consider importing this function
|
8 + use std::env::args;
|
error[E0425]: cannot find function `exit` in this scope
--> QuadraticRootsCmdLine.rs:13:3
|
13 | exit(1);
| ^^^^ not found in this scope
|
help: consider importing this function
|
8 + use std::process::exit;
|
error[E0425]: cannot find value `Utils` in this scope
--> QuadraticRootsCmdLine.rs:15:14
|
15 | let A:f64 = Utils.stodWithDefault(args[1], 0);
| ^^^^^ not found in this scope
error[E0425]: cannot find value `args` in this scope
--> QuadraticRootsCmdLine.rs:15:36
|
15 | let A:f64 = Utils.stodWithDefault(args[1], 0);
| ^^^^ not found in this scope
|
help: consider importing this function
|
8 + use std::env::args;
|
error[E0425]: cannot find value `Utils` in this scope
--> QuadraticRootsCmdLine.rs:16:14
|
16 | let B:f64 = Utils.stodWithDefault(args[2], 0);
| ^^^^^ not found in this scope
error[E0425]: cannot find value `args` in this scope
--> QuadraticRootsCmdLine.rs:16:36
|
16 | let B:f64 = Utils.stodWithDefault(args[2], 0);
| ^^^^ not found in this scope
|
help: consider importing this function
|
8 + use std::env::args;
|
error[E0425]: cannot find value `Utils` in this scope
--> QuadraticRootsCmdLine.rs:17:14
|
17 | let C:f64 = Utils.stodWithDefault(args[3], 0);
| ^^^^^ not found in this scope
error[E0425]: cannot find value `args` in this scope
--> QuadraticRootsCmdLine.rs:17:36
|
17 | let C:f64 = Utils.stodWithDefault(args[3], 0);
| ^^^^ not found in this scope
|
help: consider importing this function
|
8 + use std::env::args;
|
error[E0610]: `{integer}` is a primitive type and therefore doesn't have fields
--> QuadraticRootsCmdLine.rs:18:39
|
18 | let mut discriminant:f64 = B * B - 4.f64 * A * C;
| ^^^
|
help: if intended to be a floating point literal, consider adding a `0` after the period
|
18 | let mut discriminant:f64 = B * B - 4.0f64 * A * C;
| +
error[E0425]: cannot find function `sqrt` in this scope
--> QuadraticRootsCmdLine.rs:19:17
|
19 | discriminant = sqrt(discriminant);
| ^^^^ not found in this scope
error[E0610]: `{integer}` is a primitive type and therefore doesn't have fields
--> QuadraticRootsCmdLine.rs:20:47
|
20 | let mut root1:f64 = (-B + discriminant) / (2.f64 * A);
| ^^^
|
help: if intended to be a floating point literal, consider adding a `0` after the period
|
20 | let mut root1:f64 = (-B + discriminant) / (2.0f64 * A);
| +
error[E0610]: `{integer}` is a primitive type and therefore doesn't have fields
--> QuadraticRootsCmdLine.rs:21:47
|
21 | let mut root2:f64 = (-B - discriminant) / (2.f64 * A);
| ^^^
|
help: if intended to be a floating point literal, consider adding a `0` after the period
|
21 | let mut root2:f64 = (-B - discriminant) / (2.0f64 * A);
| +
error: aborting due to 13 previous errors
Some errors have detailed explanations: E0425, E0610.
For more information about an error, try `rustc --explain E0425`.
$ rustc QuadraticRootsCmdLine.rs
error: unknown format trait `s`
--> QuadraticRootsCmdLine.rs:12:38
|
12 | println!("{}", format!("Syntax: {0:s} a b c", utils::program_name().expect("program name should not be empty!")));
| ^
|
= note: the only appropriate formatting traits are:
- ``, which uses the `Display` trait
- `?`, which uses the `Debug` trait
- `e`, which uses the `LowerExp` trait
- `E`, which uses the `UpperExp` trait
- `o`, which uses the `Octal` trait
- `p`, which uses the `Pointer` trait
- `b`, which uses the `Binary` trait
- `x`, which uses the `LowerHex` trait
- `X`, which uses the `UpperHex` trait
error[E0425]: cannot find value `args` in this scope
--> QuadraticRootsCmdLine.rs:11:5
|
11 | if args.len() != 4 {
| ^^^^ not found in this scope
|
help: consider importing this function
|
8 + use std::env::args;
|
error[E0425]: cannot find function `exit` in this scope
--> QuadraticRootsCmdLine.rs:13:3
|
13 | exit(1);
| ^^^^ not found in this scope
|
help: consider importing this function
|
8 + use std::process::exit;
|
error[E0425]: cannot find value `Utils` in this scope
--> QuadraticRootsCmdLine.rs:15:14
|
15 | let A:f64 = Utils.stodWithDefault(args[1], 0);
| ^^^^^ not found in this scope
error[E0425]: cannot find value `args` in this scope
--> QuadraticRootsCmdLine.rs:15:36
|
15 | let A:f64 = Utils.stodWithDefault(args[1], 0);
| ^^^^ not found in this scope
|
help: consider importing this function
|
8 + use std::env::args;
|
error[E0425]: cannot find value `Utils` in this scope
--> QuadraticRootsCmdLine.rs:16:14
|
16 | let B:f64 = Utils.stodWithDefault(args[2], 0);
| ^^^^^ not found in this scope
error[E0425]: cannot find value `args` in this scope
--> QuadraticRootsCmdLine.rs:16:36
|
16 | let B:f64 = Utils.stodWithDefault(args[2], 0);
| ^^^^ not found in this scope
|
help: consider importing this function
|
8 + use std::env::args;
|
error[E0425]: cannot find value `Utils` in this scope
--> QuadraticRootsCmdLine.rs:17:14
|
17 | let C:f64 = Utils.stodWithDefault(args[3], 0);
| ^^^^^ not found in this scope
error[E0425]: cannot find value `args` in this scope
--> QuadraticRootsCmdLine.rs:17:36
|
17 | let C:f64 = Utils.stodWithDefault(args[3], 0);
| ^^^^ not found in this scope
|
help: consider importing this function
|
8 + use std::env::args;
|
error[E0610]: `{integer}` is a primitive type and therefore doesn't have fields
--> QuadraticRootsCmdLine.rs:18:39
|
18 | let mut discriminant:f64 = B * B - 4.f64 * A * C;
| ^^^
|
help: if intended to be a floating point literal, consider adding a `0` after the period
|
18 | let mut discriminant:f64 = B * B - 4.0f64 * A * C;
| +
error[E0425]: cannot find function `sqrt` in this scope
--> QuadraticRootsCmdLine.rs:19:17
|
19 | discriminant = sqrt(discriminant);
| ^^^^ not found in this scope
error[E0610]: `{integer}` is a primitive type and therefore doesn't have fields
--> QuadraticRootsCmdLine.rs:20:47
|
20 | let mut root1:f64 = (-B + discriminant) / (2.f64 * A);
| ^^^
|
help: if intended to be a floating point literal, consider adding a `0` after the period
|
20 | let mut root1:f64 = (-B + discriminant) / (2.0f64 * A);
| +
error[E0610]: `{integer}` is a primitive type and therefore doesn't have fields
--> QuadraticRootsCmdLine.rs:21:47
|
21 | let mut root2:f64 = (-B - discriminant) / (2.f64 * A);
| ^^^
|
help: if intended to be a floating point literal, consider adding a `0` after the period
|
21 | let mut root2:f64 = (-B - discriminant) / (2.0f64 * A);
| +
error: aborting due to 13 previous errors
Some errors have detailed explanations: E0425, E0610.
For more information about an error, try `rustc --explain E0425`.