有人能告诉我我做错了什么吗？ 它一直说 meal_cost is not defined

Question

def solve(meal_cost, tip_percent, tax_percent):
    # Write your code here
    meal_cost = float(input())
    tip_percent = int(input())
    tax_percent = int(input())
    
    tip = meal_cost*tip_percent/100
    tax = meal_cost*tax_percent/100
    total_cost = meal_cost + tip + tax
    
    print(round(total_cost))
    
solve(meal_cost, tip_percent, tax_percent)

Answer 1

When you call solve , you have not defined any of the parameters you pass. The solution is to define them:

def solve(meal_cost, tip_percent, tax_percent):
    # Write your code here
    meal_cost = float(input())
    tip_percent = int(input())
    tax_percent = int(input())
    
    tip = meal_cost*tip_percent/100
    tax = meal_cost*tax_percent/100
    total_cost = meal_cost + tip + tax
    
    print(round(total_cost))
    


meal_cost = 3.0
tip_percentage = 0.19
tax_percent = 0.1
solve(meal_cost, tip_percent, tax_percent)

Note that this will overwrite the values passed in because you then ask to input the actual values. You can do this instead:

def solve(meal_cost, tip_percent, tax_percent):
    tip = meal_cost*tip_percent/100
    tax = meal_cost*tax_percent/100
    total_cost = meal_cost + tip + tax
    
    print(round(total_cost))
    
meal_cost = float(input())
tip_percent = int(input())
tax_percent = int(input())
solve(meal_cost, tip_percent, tax_percent)

as pointed out by Charles in the comment.