### A good answer might be:

• What is the absolute value of -9?
• +9
• What is the absolute value of +9?
• +9

# If-Else Absolute Value

An `if` statement can be used to compute absolute value:

```if ( value < 0 )
abs = -value;
else
abs = value;
```

This is awkward for such a simple idea. The following does the same thing in one statement:

```abs = (value < 0 ) ? -value : value ;
```

This statement uses a conditional operator. The right side of the = is a conditional expression. The expression is evalutated to produce a value, which is then assigned to the variable, `abs`.

```true-or-false-condition ? value-if-true : value-if-false
```

It works like this:

1. The conditional expression evaluates to a single value.
2. That value will be one of two choices:
• If the true-or-false-condition is true, then use the expression between ? and :
• If the true-or-false-condition is false, then use the expression between : and the end .

Here is how it works with the above example:

```double value = -34.569;
double abs;

abs = (value < 0 )   ?   -value : value ;
-------------       ------
1. condition         2.  this is evaluated,
is true               to +34.569

----
3.  The +34.569 is assigned to abs
```

The conditional expression is a type of expression--that is, it asks for a value to be computed but does not by itself change any variable. In the above example, the variable `value` is not changed.

### QUESTION 2:

Given

```int a = 7, b = 21;
```

What is the value of:

```a > b ? a : b
```

(Remember, even though it looks funny, the entire expression stands for a single value.)