Re: The use of CONST and '&' as argument parameter

// call by value
void function1 (int para1)
{
para1 = 2; // modifies local copy of para1 (and not the variable
passed as para1)
}

// call by reference
void function2 (int& para1)
{
para1 = 2; // modifies the variable referenced by para1 ie x
}

void function3 (const int para1)
{
para1 = 2; // illegal - can't modify a const parameter
}

int x = 100;
function1 (x); // x still equals 100

function2 (x); // x = 2

------------------


--
Best regards
Mark

"Jack" <jl@xxxxxxxxxx> wrote in message
news:e4lgSt06FHA.1276@xxxxxxxxxxxxxxxxxxxxxxx
> In the case, which is better use
> void function1 (CONST int para1);
> or
> void function1 (int& para1);
> are they equvilent? (can't spell sorry)
> Thanks
> Jack
>


.

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