How Do I Print Multiple Parameters

Question

2.00/5 (1 vote)

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C++

#include <iostream>
using namespace std;

    int doDateofBirth(int m , int d , int y);

    int main(){

        cout << "My DoB is, " << doDateofBirth(4,14,1998) << endl;


    }

    int doDateofBirth(int m,int d,int y){
        return m,d,y;
    }

The console is only returning the y

Posted 9-Oct-15 21:47pm

Justine Cantado

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Comments

Afzaal Ahmad Zeeshan 10-Oct-15 3:56am

Did you intend to return a "string" for your date of birth?

Justine Cantado 10-Oct-15 4:07am

No i only want to return the date,day and year.

Afzaal Ahmad Zeeshan 10-Oct-15 5:14am

I only want to return — would return only one single object. You are trying to get 3. Why?

George Jonsson 10-Oct-15 5:11am

You can only return a single object from a method.
Return either a string or a class with a built in print function.
As it is now, your code doesn't make much sense.

2 solutions

Solution 2

Here is another way to do it.

C++

#include <iostream>
using namespace std;
 
    void doDateofBirth(int mym , int myd , int myy);
    int m, d, y;
 
    void main(){
        doDateofBirth(4,14,1998);
        cout << "My DoB is, " << m << d << y << endl;
    }
 
    void doDateofBirth(int mym,int myd,int myy){
        m= mym;
        d= myd;
        y= myy;
    }</iostream>

Posted 10-Oct-15 7:35am

Patrice T

Updated 10-Oct-15 7:37am

v2

Comments

George Jonsson 10-Oct-15 21:05pm

Not really C++ as you use global variables.

Patrice T 10-Oct-15 21:40pm

Why? global variables are not allowed any more?

George Jonsson 10-Oct-15 21:47pm

They are used in C, but should be avoided there too.
C++ is all about object orientation and encapsulation.
You should avoid manipulating variables outside the scope of a class, or in this case a method.
Using global variables can have very nasty side effects.

Patrice T 10-Oct-15 22:11pm

My experience is that global variables are very useful and I am still to see the nasty side effects.

George Jonsson 11-Oct-15 3:43am

Then you have been lucky.:)
Or never worked with fast and furious programmers.

Patrice T 11-Oct-15 8:18am

"Then you have been lucky."
Or good :)

George Jonsson 11-Oct-15 22:27pm

Or rather blissfully ignorant.
If you don't believe me, you can search for "why global variables are bad".
http://www.learncpp.com/cpp-tutorial/4-2a-why-global-variables-are-evil/[^]

Andreas Gieriet 11-Oct-15 18:45pm

Well, in your suggested solution you use global variables without cause. You may consult any state-of-the art coding guideline: they all say that global variables should be avoided when ever possible. There are many reasons to avoid global variables. Only the most simple single-threaded programs may safely live with global variables.
I wonder how one can argue on this topic ...
Regards
Andi

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CPallini · Accepted Answer · 2015-10-09T23:53:00

Quote:
The console is only returning the y

That is the correct behaviour of the comma operator (see here[^]).
Anyway a C/C++ function returns a single value.

However, the single return value could be an object (instance of a class or a struct) and you may define the insertion operator for such a struct or class, e.g.

C++

#include <iostream>
using namespace std;

struct DOB //'date of birth' struct
{
  int m, d, y;
};

// insertion operator for DOB objects
ostream & operator << (ostream & os, const DOB & dob)
{
  return os << dob.m << " " << dob.d << " " << dob.y;
}

DOB doDateofBirth(int m , int d , int y);

int main()
{
  cout << "My DoB is, " << doDateofBirth(4,14,1998) << endl;
}

DOB doDateofBirth(int m,int d,int y)
{
  DOB dob;
  dob.m = m; dob.d = d; dob.y = y;
  return dob;
}