Logic

1
Logic
2
Relational and Equality Operators

• Operator Condition Value
• lt xlty 1 (true)
• gt xgty 0 (false)
• lt zltw 1 (true)
• gt xgtw 0 (false)
• yy 1 (true)
• ! w!z 1 (true)
• x5, y7, za, wz

3
Logical Operators

• (and)
• 1 1 1 (true)
• 1 0, 0 1 0 (false)
• (or)
• 1 1, 1 0, 0 1 1 (true)
• 0 0 0 (false)
• ! (not)
• !1 0 (false)
• !0 1 (true)

4
Operator Precedence

• Ordered from high to low
• !, , -,
• , /,
• , -
• lt, lt, gt, gt
• , !

5
The if Statement

• if(21 gt 50)
• printf(This is impossible)
• else if(a Y)
• printf(This is impossible)
• else
• printf(This is the only alternative)

6
Nested if Statements

• if((75lt50)(1212))
• printf(1)
• if(((glty)(5!8))(17lt20))
• printf(2)
• else
• printf(3)
• else
• printf(4)

7
The switch Statement

• vacationType c
• switch(vacationType)
• case b
• case B
• printf(Beach)
• break
• case c
• printf(Cruise)
• break
• case p
• printf(Park)
• break
• default
• printf(Work)