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CS1 Python Subgoals

Section 10.3 Assessment: Functions

Subgoals for writing functions:.

  1. Define and initialize global variables
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  2. Write function header with function name and parameters (must include () even without parameters)
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    1. Optional -- Set default values for parameters
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  3. Write function body
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    1. Distinguish between global and local variables based on indentation
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  4. Determine what to return, if anything, to call site
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  5. Call function with appropriate arguments
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Exercises Exercises

    1.

    Q1: Enter the output of the following program or enter “invalid” if the statement would result in an error.
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    def first_func(a, b):
    return a + b * c

def second_func(b, c):
    return b / c

a = 10
b = 2
c = 6
print(first_func(a, second_func(b, c)))
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    2.

    Q2: How many times will the function add_variables execute in the following program?
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    def add_variables(a, b):
    return a + b
    
numbers = [6, 1, -2, 0, 2, 5, -3]
sum = 0
for number in numbers:
    sum = add_variables(sum, number)
    if sum > 10:
        break
print(sum)
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    3.

    Q3: Enter the output of the following program or enter “invalid” if the statement would result in an error.
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    my_var = 10

def update_my_var(new_val):
    my_var = new_val

update_my_var(15)
print(my_var)
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    4.

    Q4: Enter the output of the following program or enter “invalid” if the statement would result in an error.
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    def multiply(value):
    return value * 2

def subtract_and_multiply(value):
    return multiply(value - 4)

def divide(value):
    return value // 5

val = 0
for i in range(5):
    if i % 3 == 0:
        val = multiply(val)
    elif i % 3 == 1:
        val = divide(val)
    else:
        val = subtract_and_multiply(val)
print(val)
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    5.

    Q5: Put the code in the right order to create a program that prints all prime numbers between 1 and 30 (inclusive).
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