What types of clause are they?
What types of clause are the when-clause and where clause which follow "the case"? Or, what syntactic functions do they serve? I wrote them myself, but then all at once felt uncertain about the answer.

---- When you read out a decimal which integer (to the left of the decimal point) is zero, you do not leave the zero out; of course, nor do you leave out the decimal point. It's different from the case when you key a number into a calculator where you may just key in .8092 instead of 0.8092.----

Question

What types of clause are they?
What types of clause are the when-clause and where clause which follow "the case"? Or, what syntactic functions do they serve? I wrote them myself, but then all at once felt uncertain about the answer.

---- When you read out a decimal which integer (to the left of the decimal point) is zero, you do not leave the zero out; of course, nor do you leave out the decimal point. It's different from the case when you key a number into a calculator where you may just key in .8092 instead of 0.8092.----

Answer

I am not sure what you want answered. I attempt to suggest some imrpoved wording. Perhaps in this you will find an answer or a route to explain in more detail.
---- When you read out a decimal which has an integer part (to the left of the decimal point) which is zero, you do not leave the zero out. Of course, nor do you leave out the decimal point. It's different from the case when you key a number into a calculator where you may just key in .8092 instead of 0.8092.----

When you read out a decimal number whose integer part, to the left of the decimal point, is zero, you do not leave the zero ....