This code sample will solve your problem. The price_all_walls method accepts four arguments. In your wall_1(), wall_2(), wall_3() and wall_4() methods, you are calling the price_all_walls() with only one argument (the price of the wall). This will throw an error "the function definition does not exist".
When you define a function, a function prototype is associated to it (although this term is most commonly used in C and C++ programming languages), which includes the method's name and the type signature (parameter types -> not applicable in python, return type etc.). When you call the method price_all_walls(), it should be called with four arguments and hence your code could be modified as follows:
def wall_1():
height = int(input("Enter the height in meters of wall 1 :"))
width = int(input("Enter the width in meters of wall 1:"))
wall_1_price = height * width
wall_2(wall_1_price)
def wall_2(wall_1_price):
height = int(input("Enter the height in meters of wall 2:"))
width = int(input("Enter the width in meters of wall 2:"))
wall_2_price = height * width
wall_3(wall_1_price, wall_2_price)
def wall_3(wall_1_price, wall_2_price)
height = int(input("Enter the height in meters of wall 3:"))
width = int(input("Enter the width in meters of wall 3:"))
wall_3_price = height * width
wall_4(wall_1_price, wall_2_price, wall_3_price)
def wall_4(wall_1_price, wall_2_price, wall_3_price):
height = int(input("Enter the height in meters of wall 4:"))
width = int(input("Enter the width in meters of wall 4:"))
wall_4_price = height * width
price_all_walls(wall_1_price, wall_2_price, wall_3_price, wall_4_price)
def price_all_walls(wall_1_price, wall_2_price, wall_3_price, wall_4_price):
print("The total price so far is : " + str(wall_1_price + wall_2_price + wall_3_price + wall_4_price))
if __name__=="__main__":
wall_1()
Although this is a very inefficient way of doing this (no good programmer will ever suggest this). This example provides a good explanation to the question at hand.
If you would want to code this problem, I'd suggest you make use of a global variable or do it the way shown in the code below:
def wall_1():
height = int(input("Enter the height of wall 1 :"))
width = int(input("Enter the width of wall 1 :"))
wall_1_price = height * width
return wall_1_price
def wall_2():
height = int(input("Enter the height of wall 2:"))
width = int(input("Enter the width of wall 2:"))
wall_2_price = height * width
return wall_1_price
def wall_3():
height = int(input("Enter the height of wall 3:"))
width = int(input("Enter the width of wall 3:"))
wall_3_price = height * width
return wall_3_price
def wall_4():
height = int(input("Enter the height of wall 4:"))
width = int(input("Enter the width of wall 4:"))
wall_4_price = height * width
return wall_4_price
def price_all_walls(wall_1_price, wall_2_price, wall_3_price, wall_4_price):
return wall_1_price + wall_2_price + wall_3_price + wall_4_price
if __name__=="__main__":
wall_1_price = wall_1()
wall_2_price = wall_2()
wall_3_price = wall_3()
wall_4_price = wall_4()
print("The total price of the walls is : " + str(price_all_walls(wall_1_price, wall_2_price, wall_3_price, wall_4_price)))
Although anyone would suggest that the best way to do this would be as follows. Declare a function wall_n(int, int) that takes the height and width as arguments and returns the price of the wall. This leads to modular code and also provides re usability.
def wall_n(height, width):
wall_n_price = height * width
return wall_n_price
def price_all_walls(prices):
total_price = 0
for price in prices:
total_price += price
return total_price
if __name__=="__main__":
number_walls = int(input("Enter the number of walls to build : "))
wall_prices = []
for i in range(number_walls):
height = int(input("Enter the height of wall " + str(i) + " : "))
width = int(input("Enter the width of wall " + str(i) + " : "))
wall_prices.append(wall_n(height, width))
print("The total price is : " + str(price_all_walls(wall_prices)))
I have not demonstrated the use of global variables. You can read about it here
I hope this answers your question.
