CSC 430 - Review for Quiz 1

Schneider Book - Intro to VB6.0

Chapter 3 -

	objects
	events
	numbers
	strings
	I/O
	functions

Chapter 5

	IF
	SELECT-CASE

Chapter 6

	DO
	FOR-NEXT

Chapter 7

	Arrays
	Control Arrays

Chapter 11

	Frames
	Check Boxes
	Option/Radio Buttons
	Scroll Bars
	Timer Control
	Common Dialog Control

Chapter 3 -

	text box - used to get data from user
	labels - to explain what another control is for; to also display output
	command button - clicked to initiate an action
	caption property - displayed on a control
	name property - reference to the control in VB code
	event - mouse click or key press
	Format of statements using VB objects:  objectname.property = value
	event procedure - statements executed when an event occurs
	numeric operations: +, -, *, /, ^
	strings: " ... " (a double-quoted set of characters)
	concatenation operator: + or &
	data types: dim x as --- integer single long double currency variant
	important conversions: dim s as string dim n as integer n = val(s) s = str(n) s = chr(n)  n = asc(s)  '1st char of string only
	Sequential I/O: open filename for [input|output|append] as #n input #n,var1,var2,... 'inputs separated by commas or newline print #n,var1;var2;... 'no whitespace on output close #n
	Functions: dim s as string s = inputbox(prompt, title)
	comments: begin with an '
	String Functions: left mid right trim UCase len instr(string1, string2) : =0 if string2 is not contained within string1 =1st position of string2 within string1 formatting: formatnumber(12345.628,1) => 12,345.6 formatcurrency(12345.628,2) => $12,345.63 formatpercent(0.185,2) => 18.50% format( time, "hh:mm:ss")
	Random: Randomize : to seed the random number generator differently each time Rnd to yield a random number >=0 and < 1

Chapter 5 -

IF Forms:

	IF condition THEN    actions ELSE    actions END IF
	IF condition THEN   actions ELSEIF condition   actions ELSEIF condition   actions ELSE    actions END IF

SELECT CASE FORM:

SELECT CASE variable  CASE value1   actions  CASE value2,value3   actions  CASE value4 to value5   actions  CASE Is > value   actions END SELECT

Chapter 6 - 

	DO WHILE (condition)   actions LOOP
	DO   actions LOOP UNTIL (condition)
	EOF(n) - returns true if file #n is positioned at the End-of-File
	DIM X AS BOOLEAN  'x can be either TRUE or FALSE
	FOR I = startingValue TO endingValue STEP increment   actions NEXT I

Chapter 7 - 

	Arrays:  Dim array(1 to n) as datatype  ' yields exactly n items in the array; the index goes from 1 to n
	Control Arrays:  index property of the control = 0 (blank means it's not a control array)
	Refer to example on page 343 using the 'month' control array
	Dynamic Arrays: Dim x() as datatype  'in general declarations Redim x(1 to n) as datatype  'in any procedure Redim PRESERVE x(1 to m)   'will try to keep the old values of x on a Redim request

Chapter 11 - 

	Frames - creating the control first and then dragging it into a frame is bad
	Check Box - more than one can be selected;  possible values: .value = 0 => not checked .value = 1 => checked .value = 2 => greyed out
	Option/Radio Button - possible values .value = TRUE | FALSE You can set the .value to FALSE and it will 'unmark' the control
	Scroll Bars: key properties - min (for left and top) max (for right and bottom) value SmallChange LargeChange
	Timer :  key issues - .enabled = TRUE | FALSE .interval => set to a time value in milliseconds (1000 = 1 second)
	Common Dialog Control Filter ShowOpen ShowSaveAs

Designed by Dr Bernie - Last updated on Wednesday, February 18, 2009