Javascript - generate 3 random numbers that add to 100 and add them to 3 variables

Here are 2 versions of javascript to generate the three numbers and pass them back to Captivate.

NOTE - this first simple version limits the first and second numbers to a range of 1 - 45 to ensure there is some room for a third number.

var first = Math.floor((Math.random() * 45) + 1);

var second = Math.floor((Math.random() * 45) + 1);

var third = 100 - (first + second);

window.cpAPIInterface.setVariableValue("audience1", first);

window.cpAPIInterface.setVariableValue("audience2", second);

window.cpAPIInterface.setVariableValue("audience3", third);

If you want to always have a minimum value for the numbers, change the statements accordingly. This example will generate a number from 10 - 45:

var first = Math.floor((Math.random() * 35) + 10);

---------------Second version with a loop----------

This version allows values for all three numbers in the range of 10 - 80, but ensures that the total of all three numbers remains 100.

var first,second,third;

var sum = 100;

while (sum > 90){

     first = Math.floor((Math.random() * 70) + 10);

     second = Math.floor((Math.random() * 70) + 10);

     sum = first + second;

    }

third = 100 - sum;

window.cpAPIInterface.setVariableValue("audience1", first);

window.cpAPIInterface.setVariableValue("audience2", second);

window.cpAPIInterface.setVariableValue("audience3", third);

I am not a JS expert, if you want a JS only solution, wait for a JS expert. I always combine with Advanced or Shared actions

Did you read my explanation in this blog posts:

Playing with Numbers - part 1 - Captivate blog

Playing with Numbers - part 2 - Captivate blog

I would generate two random variables in the same way as described in those posts, and calculate the value of the third one with an Expression command in an advanced action. Too simple perhaps?