++p is faster as the implementation of p++ will have extra execution cycles for returning the previous memory location reference in addition to the incrementing of value.

Between ++p & p++ there is no diff in terms of speed of execution .because both are of unary . But there is a diff in the evaluation of an expression by using these unary operations.

++p - First the value of p gets incremented by one & then the incremented value will be used in the expression for further evaluation.
p++ - First the value of p is used in the expression & then the value of p will get incremented by one .

For eg :

a) p 10;


val ++p * 100 ;

Here val 1100;

p 11;

b) p 10;
val p++ * 100;
Here val 1000;
p 11;

- Jayalakshmi Kaja