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‎000 getting started/000 hello.bas

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'000 hello.bas SmallBASIC 0.12.6 [B+=MGA] 2016-06-08
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'For Code library section: 000 Getting Started
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?
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? "Getting Started: Hello World example"
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?
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? "0. From sbasicg.exe main 'Navigator' window"
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? " (the first screen you see when running sbasicg.exe)"
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?
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? "Make sure you are in the directory/folder you want."
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? " Sub-directories or folders, under the current one you"
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? " are in, are enclosed with square brackets"
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? " [I_am_a Folder]"
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? " Only .bas files will show under the folders listing."
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?
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? "You may need to 'go up' in the directory tree,"
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? " use [Go up] folder listed first under the current"
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? " directory you are in according to the Navigator"
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? " current directory listing."
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?
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? "To start a new file called Hello.bas:
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? "1. Click/tap menu File and get into File screen."
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?
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? "2. Clear first line (backspace) then type Hello"
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? " and click New, Hello.bas should appear in files listing."
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? " (You have just created a new file called Hello.bas"
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? " but you have to go back to Navigator window to edit it.)"
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?
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? "3. Click << to get back to main Navigator window"
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? " where Hello.bas should now also appear."
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?
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? "click to continue......." : pause : cls
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?
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? "4. Make sure the Editor is toggled on, Editor On mode."
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?
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? "!!! Right click mouse or tap 3 vertical bars (Android)"
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? "!!! to access the popup menu that gives access to vital"
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? "!!! functions. Call this GET POPUP."
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?
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? "You may have to toggle a couple of times"
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? " there are 3 modes from GET POPUP:"
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? " Editor [Off] run only mode, Editor [On], Editor [Live]"
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? " keep toggling (clicking or tapping that line)"
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? " until you see Editor [On]"
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?
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? "Now click on Hello.bas from Navigator window,"
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? " you should see two REM comments in editor"
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? " with new Hello.bas file loaded:"
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?
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? "5. under the two REM comments type:"
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? "print \"Hello world\""
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? "pause"
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?
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? "6. GET POPUP, select RUN"
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?
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? "7. see Hello world in output screen, yeah!"
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? "8. GET POPUP, select back"
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? "9. should be back to editor"
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? "10. GET POPUP and select back again to exit SmallBASIC"
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?
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? "click to continue......." : pause : cls
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?
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? "Comments about Hello.bas:"
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? " The PRINT keyword is so often used in SmallBASIC"
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? " it has a shortcut ? So we could also write:"
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? "? \"Hello World\""
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? " and get the same result in output window."
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?
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? "PAUSE is used to hold the output screen until a"
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? " click or keypress, without it you will only see"
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? " a flash and then be back in edit window."
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?
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? "There is an option in GET POPUP to show the Output"
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? " screen. Click/tap that and see the Output screen"
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? " anytime while you are editing. It comes in handy to"
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? " refer to that while tweaking your program."
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?
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? "A comment about comments:"
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? " REM or # can start a whole line comment at the left"
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? " most position in a line. But only ' the apostrophe"
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? " can be used to the right side of code on a line."
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?
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? "click to continue......." : pause : cls
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?
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? "HELP!"
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? " F1 will access keyword category help in the right"
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? " column of screen. From there you can access keywords."
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? " To exit back to the main editor, use esc."
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?
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? " Ctrl+h will give a listing of keyboard shortcuts"
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? " in the right column of screen. To exit that, press"
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? " esc and get focus back into editor."
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?
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? " When you run code and get an error message, press esc"
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? " to get the focus back into the editor, otherwise all"
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? " typing in the editor will be for naught!"
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?
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? " You are also invited to participate in the forum at
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? " http://smallbasic.sourceforge.net/"
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?
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? " OK, I hope this helps,
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? " B+=MGA"
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pause
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‎000 getting started/001 3 ways to print hello 5 times.bas

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REM 3 ways to print hello five time.bas 2016-03-05 SmallBASIC 0.12.2 [B+=MGA]
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'modified for 001 Getting Started
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REM remember ? is the same as PRINT, each ? is a print statement
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? "!!! Right click mouse or tap 3 vertical bars (Android)"
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? "!!! to access the popup menu that gives access to vital"
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? "!!! functions. Call this GET POPUP."
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?
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? "GET POPUP now and select View Source to see the code for this!"
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?
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? "Three Ways to PRINT hello Five Times:"
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?
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? "It's all in the punctuation at the end of a print statement."
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?
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? "1) no punctiation at the end of a print statement"
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?
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print "hello"
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print "hello"
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print "hello"
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print "hello"
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print "hello"
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?
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? "Each hello takes a whole line."
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?:? '2 blank lines, the colon : separates statements
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? "2) a comma which tabs to next avaiable tab column"
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? " and will stay on same line until run out of columns"
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?
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print "hello",
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print "hello",
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print "hello",
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print "hello",
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print "hello",
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? "& this will finish the hello, line."
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?:? 'print two are blank lines a : colon separates statements
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? "3) a semicolon (and space after hello)
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?
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print "hello ";
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print "hello ";
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print "hello ";
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print "hello ";
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print "hello ";
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'notice I put a space after hello otherwise > hellohellohellohellohello
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? "... this line needs to be finsihed."
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pause 'now we do need the pause! to see the screen before returning to editor
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# note for those not reading this from On-Line samples
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# comment out the PAUSE above, and the output screen will flash and return here
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# GET POPUP and select Show Output and you can veiw it from editor
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‎000 getting started/002 numeric variables.bas

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'002 Numeric variables.bas SmallBASIC 0.12.6 [B+=MGA] 2016-06-08
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? "!!! Right click mouse or tap 3 vertical bars (Android)"
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? "!!! to access the popup menu that gives access to vital"
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? "!!! functions. Call this GET POPUP."
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?
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? "GET POPUP now and select View Source to see this code!"
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?
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? "Numeric variables:"
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?
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? "Variables are containers. The variable/container has a"
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? "name and the variable's value is the contents found under"
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? "the name. They are called variables because the contents,"
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? "the values, are or can be switched."
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?
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? "With SmallBASIC the name must start with a letter or _ "
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? "and may be followed by more letters, _ or digits."
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?
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? "In SmallBASIC letters are not case sensitive so:"
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? "MyVariable = myvariable = MYVARIABLE = MYvariable"
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? "just spell them the same (no spaces)."
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?
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? "... press any to continue" : pause : cls
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' Here are Two typical variable assignments,
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' loading a value into a named variable
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a = 5.05 '<== you can assign a number directly
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' or you can assign values from numeric expressions
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b_1 = 2 * 2 * a / 1.01 '<== should be 20
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? "Here are two typical variable assignments just made:
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?
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? "Name:", "Value:",, "Name:", "Value:"
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? "a ", A,, "b_1 ", B_1
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?
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? "Here is look at arithmatic operators +, -,"
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? "* multiplication, / division."
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? "a + b_1 = ";A + b_1;" a - b_1 = ";A - B_1
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? "a * b_1 = ";a * b_1;" a / b_1 = ";a / b_1
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?
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? "For Powers use ^:"
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? "a squared is a ^ 2 = ";a^2
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? "b_1 cubed is b_1 ^ 3 = ";b_1^3
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? "The square root of a number n is n ^ .5 or n ^ (1/2)"
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? "The cubed root of a number n is n ^ (1/3)"
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? "So square root of a is a ^ .5 = ";a ^ .5
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? "and cube root of b_1 is b_1 ^ (1/3) = ";b_1 ^ (1/3)
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?
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? "Integer division uses \ the slash that goes the other way."
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? "With Integer division the fractional part is just dropped."
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? "7 / 2 = ";7/2;" but 7 \ 2 = "; 7 \ 2
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? "7 / 8 = ";7/8;" but 7 \ 8 = "; 7 \ 8
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?
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? "Modulus returns the remainder, 5/3 has a remainder = 2"
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? "so 5 MOD 3 = 2 (or 5 % 3 = 2)."
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? "MOD or % work with integers (no decimal in number)."
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? "2 hours past 12 o'clock is 2 o'clock but what is"
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? "49 hours past 12 o'clock ?"
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? "It is 49 mod 12 or "; 49 mod 12;" o clock"
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?
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? "... press any to continue" : pause : cls
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'123456789012345678901234567890123456789012345678901234567890
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? "Now that we have some variables and numeric operators,"
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? "Let's try input of a radius and calculation of a circle's"
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? "Area = pi * radius ^ 2
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?
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? "pi is a built in constant in SmallBASIC = ";pi
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?
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? "Next we will see INPUT keyword assigning the variable
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? "radius with a number you enter after a prompt enclosed"
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? "with double quotes:"
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?
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' The INPUT statement structure or syntax:
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' INPUT "prompt"; inputVARIABLE
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' the V's are pointing to parts
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' V key word V "prompt" semi-colon V Variable
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input "So please enter a radius now > "; radius
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? "We have assigned the value ";radius;" to radius,"
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? "using an INPUT statement, a second way to assign"
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? "values to variables. Normally we would check INPUT"
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? "values but we haven't discussed IF THEN structure."
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?
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area = pi * radius ^ 2
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? "A circle with radius ";radius;" has an area of ";area
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?
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? "... press any to continue" : pause : cls
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? "OK now is a good time to discuss the order operators"
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? "are handled, since it does not go from left to right."
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? "The main thing to remember is that + and - are done"
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? "last, next to last are * and / (mult. and divide) so:
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? "7 - 3 * 5 won't be 4 * 5 == 20 but 7 - 15 == -8."
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? " (I will start using == to mean equals)"
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? "When in doubt use () as the operations inside are"
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? "handled first: (7 - 3) * 5 == 4 * 5 == 20
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?
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? "Remember the quadratic equation?
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?
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? "Here is a case where getting the math order correct"
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? "is vital specially when expressing the two x values"
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? "possible directly from the A, B, C constants for the"
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? "equations:"
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?
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? "For x^2 + 2*x - 3 = 0
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? "if A = 1, B = 2, C = -3"
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? "then x = (-B + ( B^2 - 4*A*C)^.5 )/(2*A)"
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? " and x = (-B - ( B^2 - 4*A*C)^.5 )/(2*A)"
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rem do that in code:
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rem Next line is 3 variable assignments on one line,
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A = 1 : B = 2 : C = -3
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' a colon : separates statements in Basic
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? "x = ";(-B + (B^2 - 4*A*C)^.5)/(2*A);
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? " and x = ";(-B - (B^2 - 4*A*C)^.5)/(2*A)
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?
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? "and for x^2 - 99.1*x - 202.2 = 0
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? "let A = 1, B = -99.1, C = -202.2
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A = 1 : B = -99.1 : C = -202.2
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? "x = ";(-B + (B^2 - 4*A*C)^.5)/(2*A);
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?" and x = ";(-B - (B^2 - 4*A*C)^.5)/(2*A)
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?
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? "BASIC makes formula or equation handling easy!"
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?
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pause

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