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Subgoals

Section 1.3 Expressions-WE1-P2

Subsection 1.3.1 Subgoals for evaluating an assignment statement

  1. Determine resultant data type of expression
  2. Update variable for pre-increment or pre-decrement operators (side effect)
  3. Evaluate arithmetic expression according to operator precedence
  4. If an assignment statement (=), is Left Hand Side (LHS) a variable? Check data type of value against data type of variable.
  5. Update variable for post-increment or post-decrement operators (side effect)
For the assignment statements below, either give the new value of the assigned variable, or enter “invalid” if the statement would result in a compiler error or using an undefined value. 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 Expressions-WE1-P2

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

Exercises Exercises

1.
Q6: alpha = beta;
2.
    Q7: alpha = omega;
  • 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
3.
Q8: theta = 22;
4.
Q9: omega = beta;
5.
    Q10: theta = lambda;
    Why is this statement invalid?
  • 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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