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CS1 Python Subgoals

Section 1.3 Evaluate Expressions-WE1-P2

Subgoals for evaluating an assignment statement.

  1. Decide order of operations
    1. Decompose as necessary
  2. Determine operator behavior based on operands
    1. Operator and operands must be compatible
  3. Solve arithmetic, expression, or operation
    1. Decompose as necessary

Subsection 1.3.1

For the assignment statements below, either give the new value of the assigned variable, or enter “invalid” if the statement would result in an error. Each problem is independent of the others (e.g. Question 2 does not depend on Question 1, only the “Given” code).

Subsection 1.3.2 Evaluate Expressions-WE1-P2

Given
beta = 1
omega = 2.5
delta = '3.0'

Exercises Exercises

1.
Q6: What is the value of alpha?
alpha = beta
2.
Q7: What is the value of beta?
beta = delta
3.
Q8: What is the value of theta?
theta = 22
4.
Q9: What is the value of omega?
omega = beta
5.
    Q10: theta = gamma
    Why is this statement invalid?
  • Cannot assign a string to an integer variable
  • gamma does not have a value
  • theta does not have a value
  • Cannot assign an integer to a string variable
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