Explain "passing by value", "passing by pointer" and
"passing by reference" ?
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Answer Posted / ven
Pass by value - a copy is made
Pass by pointer ( explicit pointer)
example:
void func(int * ptr_sent)
main()
{
int i;
int *p;
p = &i;
func(p);
}
void func(int * ptr_sent)
{
*ptr_sent = *ptr_sent + 2
// adds 2 to the value in location pointed by ptr_sent
}
Pass by reference (implicit pointer)
example:
void func(int &ref_sent)
main()
{
int i;
func(&i);
}
void func(int &ref_sent)
{
ref_sent = ref_sent + 2
// adds 2 to the ref_sent
// Please note that you do not need * when using reference
// Any code manipulating reference reflects changes on i
}
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