BSL:Manual: Difference between revisions

BSL:Manual (view source)

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 ===Arithmetical===
-These operations do not change the numbers that the operators act upon; they merely provide a resulting number for your use.
+These operations do not change the numbers that the operators act upon; they merely provide a resulting number for your use. Note that there is no operator for multiplication or division. Bungie West was only concerned with creating enough scripting power to drive Oni, and they did not need "higher math" for this. See [[#Data types|Data types]] to learn the details of how math works between different data types.
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-Subtraction operator can be very tricky in BSL! For instance what do you think the following code will display?
+A quirk of the subtraction operator is that it is sensitive to whitespace. For instance, the following code will print "NOT -1":
-  if(5-6 eq -1){
+  if (5-6 eq -1)
+ {
      dmsg("-1");
   }
-  else{
+  else
-     dmsg("NOT -1");
+ {
+     dmsg("NOT -1"); # this code will run
   }
-The above displays "NOT -1", why? Because for the operator "-" to work correctly you need to have a space between it an the numbers being subtracted otherwise it may return unexpected results!
+In order for the operator "-" to work correctly, you need to have a space between it and the numbers being subtracted, otherwise it may return unexpected results! So to fix the code above, you should write it like this:
-So to fix the code above you should write it like this:
-  if(5 - 6 eq -1){
+  if (5 - 6 eq -1)
-     dmsg("-1");
+ {
+     dmsg("-1"); # this code will run
   }
-  else{
+  else
+ {
      dmsg("NOT -1");
   }
-The above displays "-1".
+Alternatively, you can use the sum operator, which doesn't suffer from this issue:
-Or you can use always Sum operator which doesn't suffer from this issue, just add the negative number and it will work as subtraction:
+  if (5+-6 eq -1)
+ {
-  if(5+-6 eq -1){
+     dmsg("-1"); # this code will run
-     dmsg("-1");
   }
-  else{
+  else
+ {
      dmsg("NOT -1");
   }
-The above displays "-1".
-Note that there is no multiplication or division. Bungie West was only concerned with creating enough scripting power to drive Oni, and they did not need "higher math" for this. See [[#Data types|Data types]] to learn the details of how math works between different data types.
 ===Relational===