Here’s a simple practice exercise for Fortran that will help you get more familiar with the language:

Write a program that calculates the area of a circle. The program should prompt the user to enter the radius of the circle, then it should calculate and print the area.

Here’s an example of what the output should look like:

`yamlCopy code````
Enter the radius of the circle: 5.0
The area of the circle is: 78.539816339744831
```

Here’s some starter code to help you get started:

`sqlCopy code````
PROGRAM CircleArea
REAL :: radius, area
REAL, PARAMETER :: pi = 3.14159
WRITE(*,*) 'Enter the radius of the circle:'
READ(*,*) radius
! Calculate the area of the circle
area = pi * radius**2
WRITE(*,*) 'The area of the circle is:', area
END PROGRAM CircleArea
```

Save the code in a .f90 or .f95 file, then compile and run it using your Fortran compiler. This simple exercise will help you practice using variables, mathematical expressions, input and output statements, and basic program flow control in Fortran.