Fat Gram Calculator
Write a program that asks for the number of calories and fat grams in a food. The program
should display the percentage of calories that come from fat. If the calories from fat are less
than 30 percent of the total calories of the food, it should also display a message indicating
the food is low in 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
Input Validation: The program should make sure that the number of calories is
greater than 0, the number of fat grams is 0 or more, and the number of calories from
fat is not greater than the total number of calories.