you cannot do nesting of post-increment operator whereas pre-increment nesting does not cause any problem
conclusion : never do post increment nesting
eg :
int a = 10; cout<<(++(++a))<<"\n";// valid in c++ cout<<((a++)++); // in-valid in c++
you cannot do nesting of post-increment operator whereas pre-increment nesting does not cause any problem
conclusion : never do post increment nesting
eg :
int a = 10; cout<<(++(++a))<<"\n";// valid in c++ cout<<((a++)++); // in-valid in c++
Why is it so? What error can it cause?
It is not possible to post-increment an r-value.
Thanks, just googled what r-value and l-value are? We cannot increment a++. Thanks!
I encountered this error in Java while trying to nest pre- and post-increment operators and came across this thread while trying to find the reason. I want to add that nesting of both pre-increment and post-increment operators is not allowed in Java. E.g. ~~~~~ int a = 5; System.out.println(++(++a)); // required: variable found: value System.out.println((a++)++); // required: variable found: value ~~~~~
Reference — 1. Postfix Expressions — https://docs.oracle.com/javase/specs/jls/se21/html/jls-15.html#jls-15.14 2. Prefix Expressions — https://docs.oracle.com/javase/specs/jls/se21/html/jls-15.html#jls-15.15.1