Difference between revisions of "EDT:Writing basic logic"

Revision as of 16:35, 10 February 2012

Basic EGL statements

EGL's basic syntax is similar to C, Java, and many other languages.

Assign x to y

y = x;

If-then statement

if ( x > 4 )
  x = y;
end

If-then-else statement

if ( x > 4 )
  x = y;
else
  x = 10;
end

if ( x > 4 )
  x = y;
else
  x = 10;
end

While loop

while ( x > 0 )
  counter += 1;
  x -= 1;
end

Call a function

doSomething();

Call a function, passing in parameters, and assign the result to a variable

z = doSomethingElse( 1, x, "hello", true );

Return from a function

return;

Return a value from a function

return ( x );

Take one action out of several alternatives, depending on the value of an expression

case ( pickles + 57 + LIMIT )
  when ( 1 )
    y = 1;
  when ( 2, 3, 4 )
    y = 2;
  when ( "hello", z )
    y = 3;
  when ( x )
    y = 4;
  otherwise
    y = 5;
end

case ( pickles + 57 + LIMIT )
  when ( 1 )
    y = 1;
  when ( 2, 3, 4 )
    y = 2;
  when ( "hello", z )
    y = 3;
  when ( x )
    y = 4;
  otherwise
    y = 5;
end

Exception handling with the try-onException statement

try
  addToAccount( 100 );
  deductFromAccount( 100 );
onException ( ex AnyException )
  SysLib.writeStderr( "Oh noes! " :: ex.message );
end

Handling more than one kind of exception

try
  addToAccount( 100 );
  deductFromAccount( 100 );
onException ( ex1 AddException )
  SysLib.writeStderr( ex1.message );
onException ( ex2 DeductException )
  SysLib.writeStderr( ex2.message );
onException ( ex3 UserException )
  SysLib.writeStderr( ex3.message );
end

@@ Line 17: / Line 17: @@
 If-then-else statement
 <source lang="java">
+if ( x > 4 )
+  x = y;
+else
+  x = 10;
+end
+</source>
+<source lang="php">
 if ( x > 4 )
    x = y;
@@ Line 52: / Line 59: @@
 </source>
-Take one action out of several, based on the value of an expression
+Take one action out of several alternatives, depending on the value of an expression
 <source lang="java">
-case ( x )
+case ( pickles + 57 + LIMIT )
+  when ( 1 )
+    y = 1;
+  when ( 2, 3, 4 )
+    y = 2;
+  when ( "hello", z )
+    y = 3;
+  when ( x )
+    y = 4;
+  otherwise
+    y = 5;
+end
+</source>
+<source lang="php">
+case ( pickles + 57 + LIMIT )
    when ( 1 )
      y = 1;
    when ( 2, 3, 4 )
      y = 2;
-   when ( "hello", z, computerIsUnplugged() )
+   when ( "hello", z )
      y = 3;
-   when ( computerIsOnFire() || pickles + 57 > LIMIT )
+   when ( x )
      y = 4;
    otherwise

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Difference between revisions of "EDT:Writing basic logic"

Revision as of 16:35, 10 February 2012

Basic EGL statements