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Subgoals

Section 2.12 Expressions-WE4-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 2.12.1

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

Exercises Exercises

1.
Q27: lambda = alpha / kappa + delta;
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What is the value of lambda? Round to 4 decimal points.
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2.
Q28: eta = alpha * beta + (omega – theta) * kappa;
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Why is this statement invalid?
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  • cannot assign a double to an int variable
  • eta does not have a value
  • eta is a constant
  • cannot assign an int to a double variable
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Given
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int r = 8;
double volume;
3.
Q29: If the formula to calculate the volume of a sphere is {V = 4/3*pi*r^3}, Which statement will calculate the volume of a sphere most accurately?
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  • volume = 4 / 3 * 3.14 * r * r * r;
  • volume = 4 / 3 * 3.14159 * r * r * r;
  • volume = 4.0 / 3 * 3.14 * r * r * r;
  • An accurate result is not possible with these data types.
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