Personal C Sharp         by    famsoft.org

General - I

EXAMPLE 3: Let us now use a much better display.
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class a:pcs {
  public override void init() {
    toa="t";                    // Select "text screen" for txt output
    base.init();                // Initialize pc# classes. Must be the last statement
  }
  public override void run() {   
    os="Hello World!";tm();     // call the text method tm() with the txt to be displayed
  }
}
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HOW TO WRITE, COMPILE AND RUN THE PROGRAM? See Example 1.
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TUTORIAL:
(1) In Example 1, the text was displayed on the Console. That was
because we did not tell PC# which text output device to use for
displaying text and the Console is the default. In this example we
have requested making the "text screen" the device to be used.
 
The text screen has been developed by PC#. It displays a scrollable
text to the user and allows the user to enter a text line which it
sends back to your program.
 
The text screen also allows the user several options like searching,
printing and filing of the displayed text.
 
(2) You may be wondering why we accessed method tm() this time
without specifying the mode. The reason is that mode "dl" is the
default mode of this method. So tm("dl") and tm() mean the same
thing to the method.

EXAMPLE 4: Let us now get into a more serious program. We'll create
a menu which gives the user the choice of displaying the "Hello
World!" message in either red, blue or green colors. Each time the
user selects one color, the message will be displayed in that color
then the menu will appear again to allow him another choice.
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public class a : pcs {
  public override void init() {
    tia=toa="t";         // Select "text screen for both text input & output
    bli=1;               // Requesting to start execution at block 1.
    base.init();         // Must be the last in init()
  }
  public override void run() {
    if (blp==1) {                    // Start of code block 1.
      cls="r0";                      // Set color to "Pure red".
      fns="trb14";                   // Set font to "times roman",bold,size 14.
      os="                                         MENU";
                                     // and display this text.
      tm();                          // Calling method tm() to execute.
      os="";tm();                    // Skip one line
      cls="S9";fns="trb10";          // Change color, font
      os="  (R) Red.";tm();          // Display this line.
      os="  (B) Blue.";tm();         // and this line.
      os="  (G) Green.";tm();        // and this line
      os="  (E) Exit.";tm();         // and this line
      os="";tm();                    // skip one line
      cls="b0";                      // Change Color.
      os="Type your selection into the text field at bottom then hit the [ENTER] key.";tm();
      os="Selection :";bli=2;tm("i");// Get user selection and jump to block 2.
    }
    if (blp==2) {                    // Start of code block 2.
      String message="Hello World."; // Message to be displayed.
      int index="EeRrBbGg".IndexOf(os);// Check selection
      if (index<0){                  // If unexpected char entered
        bli=1;um("b");               // return to block 1.
        return;                     
      }
      else if (index<2) sm("e");// If selection was "E or e" exit program
      else if (index<4) {os=message;cls="r0";tm();}
                                     // If selection was "R or r" display msg in red.
      else if (index<6) {os=message;cls="b0";tm();}
                                     // If selection was "B or b" display msg in blue.
      else if (index<8) {os=message;cls="G2";tm();}
                                     // If selection was "G or g" display msg in green.
      bli=1;um("b");                 // Then return back to block 1 to repeat the menu.
    }
  }
}
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HOW TO WRITE, COMPILE AND RUN THE PROGRAM? See Example 1.
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TUTORIAL:
(1) The first thing to notice is that the program is divided into seperate blocks. Each
block is asigned a unique number and in method init(), we have made a request to start
execution at block 1. Now why do we need blocks: