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CS1 Python Subgoals

Section 1.11 Evaluate Expressions-WE4-P1

Subgoals for evaluating an assignment statement.

  1. Decide order of operations
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    1. Decompose as necessary
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  2. Determine operator behavior based on operands
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    1. Operator and operands must be compatible
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  3. Solve arithmetic, expression, or operation
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    1. Decompose as necessary
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Subsection 1.11.1

For all given problems below indicate if the code is valid or invalid. Each problem is independent of the others (e.g. Question 2 does not depend on Question 1, only the “Given” code).
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Subsection 1.11.2 Expressions-WE4-P1

Given
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alpha = 2
beta = 1 
delta = 3 
omega = 2.5 
theta = -1.3 
kappa = 3.0
gamma = '4'
zeta = '2.5'

Exercises Exercises

1.
Q28: 
lambda = alpha / kappa + delta
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  • valid
  • invalid
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2.
Q29: 
eta = alpha * beta + (gamma - theta) * kappa
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  • valid
  • invalid
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3.
Q30: 
lambda = (gamma + zeta) * delta
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  • valid
  • invalid
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4.
Q31: 
epsilon = (gamma + zeta) * omega
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  • valid
  • invalid
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