If and If-Else

We would like to :

This is covered in the book in 3.12 and later.
- He revisits in 3.5, but that is more complex. Save it.
We used boolean expressions when we build a while loop.
- while (boolean expression)
- This was good for repeating an action.
But what if we only want to perform an action one time based on a decision
The if statement
Two forms
- ```
if (boolean expression) 
    statement;

if (boolean expression)
    statement1;
else 
    statement2; 
```
- I never use them this way. I always include code blocks.
  - ```
  if (boolean expression)  {
      statement;
  }
  
  
  if (boolean expression){
      statement1;
  } else  {
      statement2;
  }
```
- The reasoning is the same as for the while.
- And there is another problem, but I don't want to discuss it yet
- Just add code blocks.
- Semantics: if:
  - Evaluate the boolean expression
  - If it is true, execute the statement.
- Look at the flow of control in 3.1.3 of the book
- Let's write a program like one of the algorithms.
  1. Ask for the hourly rate
  2. Ask for the hours worked
  3. If hours worked is over 40,
    - overtime = (hours - 40) * rate * .5
  4. regular = hours * rate
  5. Total pay = overtime + regular
- ```
regularPay = rate * (double) hours;
if (hours > REGULAR_HOURS) {
     overtimeHours = hours-REGULAR_HOURS;
}

if (overtimeHours > 0){
     System.out.printf("For %d hours overtime, you earned an additional $%.2f\n",overtimeHours, overtimePay);
} 
```
- Pleas see pay.java