Constructs

1
Constructs

• Control Statements / Constructs
• Provide Control in Your Program
• Syntax - Structure of Construct
• if, while, do - while, for,
  switch

2
if , if-else

• if (expression) expression in
  parenthesis
• statement 1
• statement 2 block
• else
• statement 1
• statement 2 block

3
if

• If Only One Statement in Block...
• if (expression)
• statement

4
while

• while (expression)
• statement1
• statement2
• increment counter if necessary

5
do - while

• do
• statement 1
• statement 2
• increment counter if necessary
• while (expression)

6
for

• for ( counter init comparison counter
  increment)
• statement 1
• statement 2
• NO NEED to increment counter inside loop

7
switch

• switch (expression) usually a variable
• case value statement1
• break
• case value statement2
• break
• default statement 3
• break
• Executes from Hit down if you dont include
  breaks for each case!

8
Programming Style

• Leave Plenty of White Space
• Each Statement on a Separate Line
• Lots of Indentation
• Dont Stack Function Calls into Relational and
  Logical Evaluations Unless Absolutely Necessary
• Use Hungarian Notation for Naming Variables

9
Exit Logic

• Use return(variable)
• when returning a value to the calling function
• Note return is usually used to return an error
  code
• Use break
• to break out of a loop or switch
• Use continue
• to skip the remaining lines in a loop and start
  over
• Use exit( 0 ) to exit the program with no
  error
• Use exit( 1 ) to exit the program with
  error

10

• switch ( lecture )
• case done 15 Minute
• break
• exit ( LAB )