Write pseudocode that can be used to calculate the diameter, circumference, and area of a circle.

```
1. Input the radius of the circle
2. Calculate the diameter of the circle by multiplying the radius by 2
3. Calculate the circumference of the circle by multiplying the diameter by pi (3.14159)
4. Calculate the area of the circle by multiplying the radius squared by pi
5. Output the diameter, circumference, and area of the circle
```

Pseudocode:

Input:
radius (r)

Output:
diameter, circumference, area

Calculations:
- diameter = 2 - r
- circumference = 2 - π - r
- area = π - r^2

Steps:

1. Assign the value of the radius to the variable `r`.
2. Calculate the diameter by multiplying the radius by 2 and store it in the variable `diameter`.
3. Calculate the circumference by multiplying the radius by 2π (approximately 6.2832) and store it in the variable `circumference`.
4. Calculate the area by multiplying the radius squared by π and store it in the variable `area`.
5. Display the calculated values of diameter, circumference, and area.

Example:
```pseudocode
input radius

calculate diameter = 2 - radius
calculate circumference = 2 - π - radius
calculate area = π - radius - radius

display diameter, circumference, area
```