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Possible Duplicate:
Undefined Behavior and Sequence Points
Pleae explain the behaviour of following statements
int b=3;
cout<<b++*++b<<endl;
How will it be calculated?
The behavior here is undefined. See this question
Relevant standard quote:
§5/4.1 Between the previous and next sequence point a scalar object shall have its stored value modified at most once by the evaluation of an expression.The most common sequence point is the end of a statement.
Also worth noting from the standard:
§5.2.2/8 The order of evaluation of arguments is unspecified.