Pascal Programming: Week 2 Notes       


Handling I/O and Error Checking 
pg. 60-65
	Differences between Read and Readln; Write and Writeln;
	Wrong data type input:  
		examples -  	commas not allowed 
				real versus integer input
				mixed alpha-numeric
       		Exception Handling


Operator Precedence in Pascal 
	First:		NOT
	Second:		*	 / 	DIV	 MOD    AND
	Third:		+	-	 OR
	Fourth:		<=	 =	 >=	  >	 <	<>	IN

	Operators in the same group are evaluated in left-to-right order
	Parenthesis can be used to establish order


Looping Structures 
If Then Else Statement :
	IF <boolean expression> THEN
		BEGIN
		<statement>;
		<statement>
		END
	ELSE
		<statement>;
		<statement>
		END;

While Do Statement :
	WHILE <boolean expression> DO
		BEGIN
		<statement>;
		<statement>;
		END;

Repeat Until Statement :
	REPEAT
		<statement>;
		<statement>;
	UNTIL <boolean expression>;


Programming Principles, Logical Program Flow 
		Analyze Problem: Write out the basic algorithm
		Design the Structure: Flow chart the logical sequence of steps
		Code and Test



Proper Documentation  and Coding for Iterative Structures
pg. 259-265

DOCUMENT:
	Assertions: Pre-conditions, Post-Conditions
	Loop Invariant
	
Loop Design:
	1.)  The Body
	2.)  The Initializing Statement
	3.)  The Exit Criteria

Common Iterative Errors
	1.)  Uninitialized variables
	2.)  Infinite loops
	3.)  Off by one
	4.)  No or unattained exit criteria