Write a program that asks the user to enter the number of calories and fat grams in a food item. The program should display the percentage of the calories that come from fat. One gram of fat has 9 calories, so:
(Calories from fat) = (fat grams) * 9
The percentage of calories from fat can be calculated as:
(Calories from fat) / (total calories)
If the calories from fat are less than 30% of the total calories of the food, it should also display a message indicating the food is low in fat. Note: The number of calories from fat cannot be greater than the total number of calories. If the program determines that the number of calories from fat is greater than the number calories in the food item, it should display an error message indicating that the input is invalid.