At its mainly fundamendatl stage. The implementation of a c++ program is the consecutive evalution of appearance , under the control of declaration in which some appearance can make side effects . any appearance might have additional of the following side effects. access a volatile object. modify an object. Calling a function in the paradigm library. Calling any other purpose that has side effects. During the functioning of a program, there are well explain points in time called series points , at which the side effects have all been done for terms that have been evaluated , and no side outcome have been started for any unevaluated expression. At the end of every appearance that is not a subexpression After evaluate all function influence but before calling the function. When a function return: after plagiarism the return value from the function call , but before evaluate any other appearance outside the function. The command in which operands are evaluate is not mentioned , so you should never write code that depends on a exacting order. (Nutshell) Reference:- Nutshell. (n.d.). Expression Evaluation. Retrieved from http://books.google.co.in: https://books.google.co.in/books?id=Q4iP1mkfdtsC&pg=PT73&lpg=PT73&dq=Expression+Evaluation+is+discussed+in+detail+C%2B%2B+in+a+Nutshell&source=bl&ots=w_i8dxV04w&sig=NRcybavp-DPQRI7dpk8ELeTBdjI&hl=en&sa=X&ei=2sv9VJDUHNeLuASqpIKgCQ&ved=0CCkQ6AEwAg#v=onepage