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Hi all

As a newbie to C++ just wondering if you can compare a user input e.g. the
integer 2 to see if that integer is contained within a parameter list. If so
how can it be done and can it be done by referencing?

Tks

Maxd out <> wrote in message
news:u3K3b.71320$...
> Hi all
>
> As a newbie to C++ just wondering if you can compare a user input e.g. the
> integer 2 to see if that integer is contained within a parameter list. If
so
> how can it be done and can it be done by referencing?


#include <iostream>

bool contained(int& param1, int& param2, int& param3)
{
int input(0);
return (std::cin >> input) && (input == param1 ||
input == param2 ||
input == param3);
}

int main()
{
std::cout << "User input is"
<< contained(1, 2, 3) ? " " : " not "
<< "contained in parameter list\n";

return 0;
}

Did you mean something else?

-Mike

Maxd out wrote:

> Hi all
>
> As a newbie to C++ just wondering if you can compare a user input e.g. the
> integer 2 to see if that integer is contained within a parameter list.

Uh... I guess you could do this:

void func(int a, int b, int c, int d)
{
std::cout << "enter an integer: ";
int i;
std::cin >> i;

if (i == a || i == b || i == c || i == d)
{
std::cout << "That number is in the parameter list" << std::endl;
}
else
{
std::cout << "That number is not in the parameter list" << std::endl;
}
}

But somehow I don't think that's what you mean. Are you sure "Parameter
list" is the term you wanted to use?

> If so
> how can it be done and can it be done by referencing?

What is "referencing"?

Your question is very unclear.

-Kevin
--
My email address is valid, but changes periodically.
To contact me please use the address from a recent posting.

"Mike Wahler" <> wrote in message
news:LtK3b.363$ .net...
|
| Maxd out <> wrote in message
| news:u3K3b.71320$...
| > Hi all
| >
| > As a newbie to C++ just wondering if you can compare a user input e.g. the
| > integer 2 to see if that integer is contained within a parameter list. If
| so
| > how can it be done and can it be done by referencing?
|
|
| #include <iostream>
|
| bool contained(int& param1, int& param2, int& param3)
| {
| int input(0);
| return (std::cin >> input) && (input == param1 ||
| input == param2 ||
| input == param3);
| }
|
| int main()
| {
| std::cout << "User input is"
| << contained(1, 2, 3) ? " " : " not "
| << "contained in parameter list\n";

std::cout << "User input is "
<< contained( 1, 2, 3 ) ? std::cout << " " :
std::cout << " not contained in parameter list\n";


Hello Mike, you left a couple of important bits out .

Btw, why not pass by const reference, or by value ?
It saves the warnings about temporaries.

Cheers.
Chris Val

Chris ( Val ) wrote:
> "Mike Wahler" <> wrote in message
> news:LtK3b.363$ .net...
> |
> |
> | #include <iostream>
> |
> | bool contained(int& param1, int& param2, int& param3)
> | {
> | int input(0);
> | return (std::cin >> input) && (input == param1 ||
> | input == param2 ||
> | input == param3);
> | }
> |
> | int main()
> | {
> | std::cout << "User input is"
> | << contained(1, 2, 3) ? " " : " not "
> | << "contained in parameter list\n";
>
> std::cout << "User input is "
> << contained( 1, 2, 3 ) ? std::cout << " " :
> std::cout << " not contained in parameter list\n";

I don't believe there is an operator<<(ostream, ostream) available, so
your code will not compile. Even if it did it wouldn't give the right
output. The original code was fine.

>
>
> Hello Mike, you left a couple of important bits out .
>
> Btw, why not pass by const reference, or by value ?
> It saves the warnings about temporaries.

You are right on this point. But I think the warnings should be errors.

-Kevin
--
My email address is valid, but changes periodically.
To contact me please use the address from a recent posting.