I need help completed Chapter 7 Programming exercise 2 code and chart for Starting out with Programming Logic edition 4

this is what I have so far and as I check it, says need to initialize fatgrams:

//Constant LOW_FAT = 0.3

//Main module

Module main()

//Local variables

Declare Real fatgrams, calories

//Get the number of fat grams

Call getFatGrams(fatgrams)

//Get the number of calories

Call getCalories(calories)

//Calculate the percentage of calories that come from fat. //Percentage of calories from fat = (fatGrams*9) / Calories

Call caloriesPercentage

//Display percentage

Call displayPercentage(percentage)

End Module