Answer / guest

$ pass by value: it does not change the content of the
argument variable in the calling function even if they
changed in the called function.Because the content of the
actual parameter in the caller is copied to the
formalparameter of the callee.
so change to the parameter withen the function
will effect only the copy.

$ pass by pointer or pass by address:in this the address of
actual parameters is passed i.e address of the variable
copied in the called function.
so any change to the parameter within the
function will reflect to the caller function parameter i.e
actual parameters are modified.

$ pass by referance : it has syntax of pass by value and
funcionality of pass by pointer.
i.e
the referance type formal parameter are accessed in the same
way as normal value parameters but if any change to them
will also reflected to the actual parameter.

see the diff:

P by V:
int main()
{
int a,b;
f(a,b);//caller
}
f(int x, int y);//called

$P by P:

int main()
{
int a,b;
f(&a,&b);//caller
}
f(int *x, int *y);//called

$ P by R:

int main()
{
int a,b;
f(a,b);//caller
}
f(int &x, int &y);//called

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