The programming language is not stated. I will answer this question using Python.
The program in Python where comments are used to explain each line is as follows:
#This defines the function
def calculate_area(side_length):
#This check if the side length is 0 or less
if side_length<1:
#If yes, the side length is set to 10
side_length = 10
#This prints the area of the square
print("The area of a square with sides of length",side_length,"is",(side_length**2))
#The main begins here
#This gets input for the length of the square
length = int(input("Enter side length: "))
#This calls the calculate_area function
calculate_area(length)
#The program ends here
At the end of the program, the area of the square is calculated and printed.
See attachment for a sample run
Read more about Python programs at:
https://brainly.com/question/22841107