# Subgoals

## Section5.1Worked Example: If Statements

### Subgoals for Evaluating Selection Statements.

1. Diagram which statements go together
2. For if statement, determine whether expression is true or false
3. If true – follow true branch, if false – follow else branch or do nothing if no else branch

### Subsection5.1.1

You can watch this video or read through the content below it.
Given the following declarations:
double omega = 2.5;
double kappa = 3.0;
double rho = 0.0;

Evaluate these statements and determine the value of all variables used.
if (kappa > omega)
rho = kappa + 2;


### Subsection5.1.2SG1: Diagram which statements go together.

If no { } are present, then by default all if and else branches have only a single statement:
if (kappa > omega)
rho = kappa + 2;


### Subsection5.1.3SG2: For if statement, determine whether true or false

First we evaluate (kappa > omega):
(3.0 > 2.5) is TRUE

### Subsection5.1.4SG3: If true, follow true branch. If false, follow else branch (OR do nothing if there is no else branch).

The condition is TRUE so we execute the true branch:
rho = kappa + 2
= 3.0 + 2
= 5.0
omega = 2.5, kappa = 3.0, rho = 5.0;