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EDT:Writing statements
Revision as of 12:19, 13 February 2012 by Margolis.us.ibm.com (Talk | contribs)
EGL provides general statements, as well as statements that interact with a data source or external logic.
General statements
The general statements are case, continue, exit, for, if, move, return, throw, transfer, try, use, and while.
Case
The case statement responds to conditions at run time by executing one set of statements rather than another:
- You can test a criterion value. The following example invokes
mySecondFunction
:
function test() x Int = 3; case (x) when (1) myFirstFunction(); when (2, 3, 4) mySecondFunction(); otherwise myDefaultFunction(); end end
- You can test a set of logical expressions. The following example displays only "x passes":
function test() x Int = 3; y Int = 5; z Int = 7; case when (x == 3) SysLib.writeStdOut("x passes"); when (y == 5) SysLib.writeStdOut("y passes"); when (z == 7) SysLib.writeStdOut("z passes"); otherwise SysLib.writeStdErr("You will not see this message."); end end end
As shown, no more than one clause executes. Control does not “fall through” from one clause to the next.