Unit5-03: Return Values

Learning Outcome

At the end of this lesson, you will be able to:

• understand and create your own function that has a return value

Quiz Questions

1. What is the difference between a parameter and an argument?

2. What does it mean to "pass by value"?

3. For the following function in Python:

a) What is the name of the function?

b) How many parameters does it take?

c) State each parameter type.

d) What does the function return?

e) State what will occur by the following:
print_name("Sophie", "A", "Student")

4. For the following function in C++:

a) What is the name of the function?

b) How many parameters does it take?

c) State each parameter type.

d) What does the function return?

e) State what will occur by the following:
PrintStudent("Sophie Student", 16)

Here is the Problem:

• Create a program called "Grade Program" that has a function that takes a level and returns the middle percentage mark.

  • Name the function "calc_mark(level)" in Python and "calcMark(string level)" in C++

  • Use the switch statement you learned in Unit 3. (You will have do to a workaround in Python.)

  • It will accept the level as a string (see the Ontario rubric chart here)

  • It will return the middle percentage mark.

  • Remember:

    • if you have a flowchart that repeats a similar pattern

      • put the first couple statements

      • then use "..."

      • then put the last statement and any error case

    • only place one return statement at the very end of the function, not several inside an if statement

    • if "invalid" input is passed to the function (a string that is not a valid level), return a "-1"