1.3.1. Expressions-WE3-P1

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 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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Expressions-WE3-P1

Given

int alpha = 2, beta = 1, delta = 3, eta, gamma;
double omega = 2.5, theta = -1.3, kappa = 3.0, lambda, rho;

Q17: lambda = beta * theta;

• valid
• invalid

Q18: eta = alpha * kappa;

• valid
• invalid

Q19: alpha = beta + delta;

• valid
• invalid

Q20: beta = beta * alpha;

• valid
• invalid

public class main{ public static void main(String args[]){ } }

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