Pure Programmer
Project: Sample Mean
To calculate the [[Sample_mean_and_covariance|mean]] (or average)
is the sum of a number of random samples divided by the number in the sample. Write a program that computes the mean of 10 random floating point values in the interval [0,1). This closed/open [[Interval_(mathematics)|interval]] notation means 0 is in the range but 1 is not. Print the mean to four decimal places. Run the program multiple times to confirm that you get different results each time.Output
$ rustc SampleMean.rs
error: unknown format trait `f`
--> SampleMean.rs:19:44
|
19 | println!("{}", format!("Sample mean: {0:.4f}", sum / f64::from(10)));
| ^
|
= 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 function `random` in this scope
--> SampleMean.rs:9:9
|
9 | sum += random();
| ^^^^^^ not found in this scope
error[E0425]: cannot find function `random` in this scope
--> SampleMean.rs:10:9
|
10 | sum += random();
| ^^^^^^ not found in this scope
error[E0425]: cannot find function `random` in this scope
--> SampleMean.rs:11:9
|
11 | sum += random();
| ^^^^^^ not found in this scope
error[E0425]: cannot find function `random` in this scope
--> SampleMean.rs:12:9
|
12 | sum += random();
| ^^^^^^ not found in this scope
error[E0425]: cannot find function `random` in this scope
--> SampleMean.rs:13:9
|
13 | sum += random();
| ^^^^^^ not found in this scope
error[E0425]: cannot find function `random` in this scope
--> SampleMean.rs:14:9
|
14 | sum += random();
| ^^^^^^ not found in this scope
error[E0425]: cannot find function `random` in this scope
--> SampleMean.rs:15:9
|
15 | sum += random();
| ^^^^^^ not found in this scope
error[E0425]: cannot find function `random` in this scope
--> SampleMean.rs:16:9
|
16 | sum += random();
| ^^^^^^ not found in this scope
error[E0425]: cannot find function `random` in this scope
--> SampleMean.rs:17:9
|
17 | sum += random();
| ^^^^^^ not found in this scope
error[E0425]: cannot find function `random` in this scope
--> SampleMean.rs:18:9
|
18 | sum += random();
| ^^^^^^ not found in this scope
error: aborting due to 11 previous errors
For more information about this error, try `rustc --explain E0425`.
$ rustc SampleMean.rs
error: unknown format trait `f`
--> SampleMean.rs:19:44
|
19 | println!("{}", format!("Sample mean: {0:.4f}", sum / f64::from(10)));
| ^
|
= 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 function `random` in this scope
--> SampleMean.rs:9:9
|
9 | sum += random();
| ^^^^^^ not found in this scope
error[E0425]: cannot find function `random` in this scope
--> SampleMean.rs:10:9
|
10 | sum += random();
| ^^^^^^ not found in this scope
error[E0425]: cannot find function `random` in this scope
--> SampleMean.rs:11:9
|
11 | sum += random();
| ^^^^^^ not found in this scope
error[E0425]: cannot find function `random` in this scope
--> SampleMean.rs:12:9
|
12 | sum += random();
| ^^^^^^ not found in this scope
error[E0425]: cannot find function `random` in this scope
--> SampleMean.rs:13:9
|
13 | sum += random();
| ^^^^^^ not found in this scope
error[E0425]: cannot find function `random` in this scope
--> SampleMean.rs:14:9
|
14 | sum += random();
| ^^^^^^ not found in this scope
error[E0425]: cannot find function `random` in this scope
--> SampleMean.rs:15:9
|
15 | sum += random();
| ^^^^^^ not found in this scope
error[E0425]: cannot find function `random` in this scope
--> SampleMean.rs:16:9
|
16 | sum += random();
| ^^^^^^ not found in this scope
error[E0425]: cannot find function `random` in this scope
--> SampleMean.rs:17:9
|
17 | sum += random();
| ^^^^^^ not found in this scope
error[E0425]: cannot find function `random` in this scope
--> SampleMean.rs:18:9
|
18 | sum += random();
| ^^^^^^ not found in this scope
error: aborting due to 11 previous errors
For more information about this error, try `rustc --explain E0425`.
$ rustc SampleMean.rs
error: unknown format trait `f`
--> SampleMean.rs:19:44
|
19 | println!("{}", format!("Sample mean: {0:.4f}", sum / f64::from(10)));
| ^
|
= 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 function `random` in this scope
--> SampleMean.rs:9:9
|
9 | sum += random();
| ^^^^^^ not found in this scope
error[E0425]: cannot find function `random` in this scope
--> SampleMean.rs:10:9
|
10 | sum += random();
| ^^^^^^ not found in this scope
error[E0425]: cannot find function `random` in this scope
--> SampleMean.rs:11:9
|
11 | sum += random();
| ^^^^^^ not found in this scope
error[E0425]: cannot find function `random` in this scope
--> SampleMean.rs:12:9
|
12 | sum += random();
| ^^^^^^ not found in this scope
error[E0425]: cannot find function `random` in this scope
--> SampleMean.rs:13:9
|
13 | sum += random();
| ^^^^^^ not found in this scope
error[E0425]: cannot find function `random` in this scope
--> SampleMean.rs:14:9
|
14 | sum += random();
| ^^^^^^ not found in this scope
error[E0425]: cannot find function `random` in this scope
--> SampleMean.rs:15:9
|
15 | sum += random();
| ^^^^^^ not found in this scope
error[E0425]: cannot find function `random` in this scope
--> SampleMean.rs:16:9
|
16 | sum += random();
| ^^^^^^ not found in this scope
error[E0425]: cannot find function `random` in this scope
--> SampleMean.rs:17:9
|
17 | sum += random();
| ^^^^^^ not found in this scope
error[E0425]: cannot find function `random` in this scope
--> SampleMean.rs:18:9
|
18 | sum += random();
| ^^^^^^ not found in this scope
error: aborting due to 11 previous errors
For more information about this error, try `rustc --explain E0425`.