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Chanuka PereraChanuka Perera 

I am new to coding. What do you type inside brackets (). I have seen some codes () or some codes for example (integer n) . Can anyone explain with an example

Ishwar ShindeIshwar Shinde
I think, this doc will help you to understand the class method structure- https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_classes_defining_methods.htm

Go through it.
Chanuka PereraChanuka Perera
thank you