How to count all the "Yes" answers from 20 questions?

Thanks!

The script provided is working.

Sorry for this shortcoming on my part as this is the first time I will be using Dropbox.

Please try this public link in Dropbox ...

https://www.dropbox.com/s/us7m23vs4af1tay/Sample.pdf?dl=0

Please find the link below

https://www.dropbox.com/h

If you cannot access the link, here is a sample

Section 1

Fieldname:    Question11               Text

                      Question12               Text

Fieldnames Question11 to Question15 should be answerable by "Yes" or "No"

What I want to happen is for Section1YesCount to automatically compute the number of "Yes" from Question11 to Question15.

Example:

Question11      Yes

Question12      Yes

Question13      No

Question14      No

Question15      Yes

Therefore, Section1YesCount should be equal to 3.

Then you can do it like this:

var total = 0;
for (var i=1; i<=30; i++) {
    var fname = "ANSWER" + ((i<10) ? "0"+i : i);
    var f = this.getField(fname);
    if (f.valueAsString=="Yes") total++;
}
event.value = total;

Use this code as the custom calculation script of the field where you want to show the total number of Yes boxes ticked.

What are the names of the fields?