Which issues have you encountered due to sequence points in C and C++?

Question

Below are two common issues resulting in undefined behavior due to the sequence point rules:

a[i] = i++; //has a read and write between sequence points
i = i++;          


        

Answer 1

Here is a simple rule from Programming principles and practices using c++ by Bjarne Stroustup

"if you change the value of a variable in an expression.Don't read or write twice in the same expression"

a[i] = i++; //i's value is changed once but read twice
i = i++;   //i's value is changed once but written twice