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Subgoals

Section 2.3 Expressions-WE1-P2

Subgoals for evaluating an assignment statement.

  1. Determine resultant data type of expression
  2. Update variable for pre operators based on side effect
  3. Solve arithmetic equation, operator precedence
  4. Is the Left Hand Side (LHS) of the assignment statement a variable? Check the data type of the value on right hand side (RHS) against data type of LHS variable.
  5. Update variable for post operators based on side effect
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Subsection 2.3.1

Given
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int alpha, gamma;
int beta = 1;
double omega = 2.5;
double theta, lambda;

Exercises Exercises

1.
Q6: alpha = beta;
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What is the value of alpha?
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2.
Q7: alpha = omega;
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Why is this statement invalid?
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  • cannot assign a double to an int variable
  • lambda does not have a value
  • omega does not have a value
  • cannot assign an int to a double variable
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3.
Q8: theta = 22;
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What is the value of theta?
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4.
Q9: omega = beta;
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What is the value of omega?
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5.
Q10: theta = lambda;
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Why is this statement invalid?
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  • cannot assign a double to an int variable
  • lambda does not have a value
  • theta does not have a value
  • cannot assign an int to a double variable
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