Passing by Reference

[Neb]

Hi all,

Im new to c/c++ programming and am having difficulty in passing more
than one parameter into and out of a function.

//PASS BY REFERENCE
#include <stdio.h>
void swapnum(int &i,int &j)
{
int temp = i;
i = j;
j = temp;
return;
}

int main()
{
int a = 10;
int b = 20;

swapnum(a, b);
printf("A is %d and B is %d\n", a, b);
return (0);
}

In compiling I am recieving the error:

Error E2293 test.ccp 4: ) expected


Thanks in advance, any help is greatly appreciated.


--
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
[ comp.lang.c++.moderated. First time posters: Do this! ]

[James K. Lowden]

On Mon, 16 Apr 2012 07:04:53 -0700 (PDT)
Neb <nu...@nowhere.com> wrote:

> In compiling I am recieving the error:
>
> Error E2293 test.ccp 4: ) expected

You're invoking the C compiler, not the C++ compiler, perhaps because
the extension you're using is ".ccp", not the conventional ".cpp".

As a beginner, I suggest you not call any program "test", only to save
yourself some confusion and frustration. On systems other than
Windows, there is usually a program called "test", often /bin/test.
Unless you're careful, you'll invoke that test instead of yours.

Besides, you'll have a lot of tests. Make a test directory, call it
"t", and put your program in it. This one might be called
"t/swap.cpp".

And use <iostream>, not <stdio.h>. It's typesafe, and it's fun. :-)

HTH.

--jkl

[Ulrich Eckhardt]

Am 16.04.2012 16:04, schrieb Neb:
> Im new to c/c++ programming and am having difficulty in passing more
> than one parameter into and out of a function.

Note up front: Since this is a moderated group, you have a rather high
latency until your posting shows up. For complex questions, this doesn't
matter, but for short questions I'd either suggest the dedicated
beginners' group (comp.lang.learn.c-c++) or one of the C++ channels on
IRC, where you might get help in real time.


> #include <stdio.h>

If any book starts with teaching printf(), it is probably a bad book for
learning C++, provided you want to learn C++ and not C. Note that it
isn't clear which of those two _distinct_ languages you want to learn.

> void swapnum(int &i,int &j)
> {
> int temp = i;
> i = j;
> j = temp;
> return;
> }

Note that in <algorithm> (or was it <utility>?) is a function called
std::swap() which does exactly the above.

> Error E2293 test.ccp 4: ) expected

I haven't tried it but the code is C++ and seems actually okay. However,
I think you are compiling it with a C compiler, is that possible? The C
compiler then chokes on the references, which only C++ supports. Also
note that typically, C++ source files are called "cpp" and not "ccp".

Good luck!

Uli

[Neb]

{ Please restrict your quoting to the minimum needed to
establish context -mod/we }

On 16/04/2012 10:04 PM, Neb wrote:
> Hi all,
>
> Im new to c/c++ programming and am having difficulty in passing more
> than one parameter into and out of a function.
>
> //PASS BY REFERENCE
> #include <stdio.h>
> void swapnum(int &i,int &j)
> {
> int temp = i;
> i = j;
> j = temp;
> return;
> }
>
> int main()
> {
> int a = 10;
> int b = 20;
>
> swapnum(a, b);
> printf("A is %d and B is %d\n", a, b);
> return (0);
> }
>
> In compiling I am recieving the error:
>
> Error E2293 test.ccp 4: ) expected
>
>
> Thanks in advance, any help is greatly appreciated.
>
>

Thanks for the advice fellas.

The issue was with the filetype, should have been .cpp vs .ccp.