Summary

Section 9.13 Summary

Various ways to use branching statements in C:

```
if (condition){
  statement;
}
```

if (condition){
  statement1;
  statement2;
  ...
}

if (condition){
  statement(s);
} else {
  statement(s);
}

if (condition){
  statement(s);
} else if (other condition){
  statement(s);
} else if (yet another condition){
  statements(s);
} else {
  statement(s);
}

There can be as many if-else cases as you would like.
The final else statement can be omitted if that makes sense.

Several conditions can be combined with logic operators:

&& is the logical AND
|| is the logical OR
! is the logical NOT
DeMorgan 1: !(A && B) == (!A) || (!B)
DeMorgan 2: !(A || B) == (!A) && (!B)

Relational and equality operators are:

< less than
> greater than
<= less than or equal
>= greater than or equal
== equal
!= not equal

A few extra topics when it comes to branching and logic expressions in coding:

Operator precedence in logic expressions
Using a "flag" variable to represent true/false
Translating logical expressions from English to C
Negating logical expressions

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