SCI Programming Language/Control Flow - Revision history

Andrew Branscom at 00:10, 27 May 2016

2016-05-27T00:10:38Z

2016-05-26T04:17:32Z

return

2016-05-26T04:16:39Z

contif

2016-05-26T04:16:03Z

continue

2016-05-26T04:15:22Z

break

2016-05-26T04:14:56Z

breakif

2016-05-26T04:14:04Z

break

2016-05-26T04:13:03Z

Supporting constructs tor iteration

2016-05-26T04:11:11Z

repeat

2016-05-26T04:10:46Z

repeat

@@ Line 24: / Line 24: @@
 &nbsp;
-== Control Flow ==
+==<br /> Control Flow ==
 The value of a control flow expression is the value of the last expression in the control body which was evaluated. Thus, if we execute the following code:

@@ Line 286: / Line 286: @@
 ==<br /> return ==
+<blockquote>
-(return [expression))
+<code>(return [expression))</code>
 The return statement returns control to the procedure which called the currently executing procedure. If the optional expression is present, that value is returned as the value of the current procedure. There is an implicit return at the end of all procedures, and the value returned in that case is the value of the last expression evaluated. A return from the main procedure of script 0 returns to the operating system.
-example:
+''example:''
 <div class="CodeBlockHeader">Code:</div>
 <syntaxhighlight lang="sci">
@@ Line 299: / Line 300: @@
+)
 </syntaxhighlight>
 ;Notes

@@ Line 266: / Line 266: @@
 ===<br /> contif ===
+<blockquote>
-(contif expression [n])
+<code>(contif expression [n])</code>
 If expression is not FALSE, loop back to the beginning of the nth level loop. If n is not specified, loop to the beginning of the innermost loop.
@@ Line 281: / Line 281: @@
+)
 </syntaxhighlight>
 </blockquote>
 </blockquote>

@@ Line 250: / Line 250: @@
 ===<br /> continue ===
+<blockquote>
-(continue [n])
+<code>(continue [n])</code>
 Loop back to the beginning of the nth level loop. If n is not specified, loop to the beginning of the innermost loop.
-Page 19
+<blockquote>
 (for ((i = -5)) << i 5) ((++ i))
        (if (== i 0) (continue))
        (=x (/ y i))
+)
 ===<br /> contif ===

@@ Line 212: / Line 212: @@
 <blockquote>
 ===<br /> break ===
+<blockquote>
 <code>(break [n])</code>
@@ Line 227: / Line 227: @@
+)
 </syntaxhighlight>
 </blockquote>

@@ Line 230: / Line 230: @@
 ===<br /> breakif ===
-(breakif expression [n])
+If expression is not FALSE, break out of n levels of loops. If n is not specified, break out of the innermost loop.
-If expression is not FALSE, break out of n levels of loops. If n is not specified, break out of the innermost loop.
+''example: &nbsp;Repeat incrementing i until i > n.''
 <div class="CodeBlockHeader">Code:</div>
 <syntaxhighlight lang="sci">
@@ Line 244: / Line 245: @@
+)
 </syntaxhighlight>
 ===<br /> continue ===

@@ Line 194: / Line 194: @@
 Continually execute the code until some condition in the code (a break) causes the loop to be exited. This is equivalent to:
-(while TRUE code) or (for (0) TRUE (0) code)
+<blockquote><code>(while TRUE code) or (for (0) TRUE (0) code)</code></blockquote>
 ''example: &nbsp;Set x =x + 2. Note that this will loop forever.''