Re: "break" equivalent in Macro language.

Posted by Michael Ellis on Dec 07, 2010; 3:09pm
URL: http://imagej.273.s1.nabble.com/break-equivalent-in-Macro-language-tp3686262p3686266.html

Dear Ved, your code and my code differ. Look carefully at the "if/else" statement in my example:

a = 0;
b = 0;
var done = false; // used to prematurely terminate loop
for (i=0;i<10 && !done;i++) {
        // code 1
        print("a is " + a++);
        if (a==3) {
                done = true; // break
        } else {
                // code 2
                print("b is " + b++);
        }
}
// code 3

When a is equal to 3 done is set to true. code 2 is inside the else branch of the conditional statement and will NOT be executed when a == 3.

code 3 will be executed.

Try pasting the example into the Image macro and executing it. The output you should see in the log window is

a is 0
b is 0
a is 1
b is 1
a is 2


Regards -- Michael Ellis

On 7 Dec 2010, at 14:53, Ved Sharma wrote:

> a=0;
> for (i=0;i<10;i++) {
>   code1;
>   a++;
>   if (a==3) break;
>   code2;
> }
> code3;
>
>
> In the above example, I want to break as soon as a==3, so that it does not execute code2. It should terminate for loop and go on to execute code3.
>
> Michael, setting i to a very large value or using a variable done (as in your example) still evaluates the condition i<10, which causes code2 to run.
>
> Ved