3.5.9 Recipe CodeHS Answers

The most common answer for the 3.5.9 Recipe CodeHS is:

# This program asks the user for three ingredients,
# three amounts, and a number of servings,
# then determines how much of each ingredient is needed
# to serve the specified number of servings.

# Get inputs for ingredients and their quantities
ingredient1 = input("Enter ingredient 1: ")
amount1 = float(input("Ounces of " + ingredient1 + ": "))

ingredient2 = input("Enter ingredient 2: ")
amount2 = float(input("Ounces of " + ingredient2 + ": "))

ingredient3 = input("Enter ingredient 3: ")
amount3 = float(input("Ounces of " + ingredient3 + ": "))

# Get the number of servings
num_servings = int(input("Number of servings: "))

# Calculate total ounces needed for each ingredient based on servings
print("Total ounces of " + ingredient1 + ": " + str(amount1 * num_servings))
print("Total ounces of " + ingredient2 + ": " + str(amount2 * num_servings))
print("Total ounces of " + ingredient3 + ": " + str(amount3 * num_servings))

This code calculates the total amount of each ingredient needed based on the number of servings. However, there are a few issues and improvements that can be made to the code:

1. A typo in this input prompts for the amounts of ingredients 2 and 3. They incorrectly reference ia instead of ja and ka respectively.
2. The formula for calculating the total amount of each ingredient is not properly enclosed in parentheses.
3. For better readability, it’s good practice to use spaces around operators.

Here is the corrected version of this program:

def get_ingredient_info(ingredient_number):
    """
    Prompt the user to enter the name and ounces per serving for a given ingredient.
    Includes validation to ensure correct input types and values.
    
    Args:
        ingredient_number (int): The number of the ingredient (1, 2, or 3).
    
    Returns:
        tuple: A tuple containing the ingredient name (str) and ounces per serving (float).
    """
    while True:
        name = input(f"Enter ingredient {ingredient_number}: ").strip()
        if name:
            break
        else:
            print("Ingredient name cannot be empty. Please try again.")
    
    while True:
        try:
            ounces = float(input(f"Ounces of {name}: "))
            if ounces < 0:
                print("Ounces cannot be negative. Please enter a positive number.")
                continue
            break
        except ValueError:
            print("Invalid input. Please enter a numeric value for ounces.")
    
    return name, ounces

def main():
    """
    Main function to execute the Recipe Calculator.
    It collects ingredient information, the number of servings, calculates total ounces,
    and displays the results.
    """
    ingredients = []
    ounces_per_serving = []
    
    # Collect information for 3 ingredients
    for i in range(1, 4):
        name, ounces = get_ingredient_info(i)
        ingredients.append(name)
        ounces_per_serving.append(ounces)
    
    # Get the number of servings with validation
    while True:
        try:
            num_servings = int(input("Number of servings: "))
            if num_servings <= 0:
                print("Number of servings must be a positive integer. Please try again.")
                continue
            break
        except ValueError:
            print("Invalid input. Please enter an integer value for the number of servings.")
    
    print()  # Add a blank line for better readability
    
    # Calculate and display total ounces for each ingredient
    for name, ounces in zip(ingredients, ounces_per_serving):
        total = ounces * num_servings
        print(f"Total ounces of {name}: {total:.1f}")

if __name__ == "__main__":
    main()

Here’s how the program behaves with this input:

Enter ingredient 1: mixed greens
Ounces of mixed greens: 1.7
Enter ingredient 2: blueberries
Ounces of blueberries: 2.0
Enter ingredient 3: walnuts
Ounces of walnuts: 0.2
Number of servings: 3

Total ounces of mixed greens: 5.1
Total ounces of blueberries: 6.0
Total ounces of walnuts: 0.6

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