C++: STRING Function returns hexadecimal value instead of string

Question

during my 2nd month learning C++ I got to this: STRING type function to build up and return menu from two user-input dishes (compliled and run in VisualStudio2013)

#include "../../std_lib_facilities.h"

string LeMenu(string meal, string dessert) //a F() concatenates 2 strings
{
    return meal, dessert;  //also tried meal+dessert
}                   

int main()
{
    string course1, course2;
    cout << "What is your chice today Sir?\n";
    cin >> course1 >> course2;                  //request to input meals
    LeMenu(course1,course2);
    cout << "Is " << LeMenu << " ok?\n";        //here we output
    keep_window_open();
}

But it always returns a HEXADECIMAL VALUE, and I do not know why: (compliled and run in VisualStudio2013)

Is 012D15CD ok?

instead of Is JamEggs ok? (as an example)

From what I have learnt I do not see why, my text book does not even suggests this as a likely issue and I can not find any hint on the internet!. More than a way to solve it it would be nice to understand if this is an expected mssbehavior or not. Thank you all!

To explain further, , is a legal operator, but it doesn't do what you think (and you should avoid using it if you're learning C++, it won't be useful in most cases). , will evaluate the left expression, discard its result, evaluate the right expression and evaluate to the right expression's result (Edit: see this, not to be mistaken with commas in function calls/definitions or in initializer lists though). — Caninonos
– Caninonos, Commented Aug 3, 2015 at 15:44
Could these s****ing robo upvoters please stop to upvote each and every bad 1 rep user question here! — πάντα ῥεῖ
– πάντα ῥεῖ, Commented Aug 3, 2015 at 15:54

yizzlez · Accepted Answer · 2015-08-03 15:41:50Z

4

You are printing out the function address of LeMenu. Try this instead:

cout << "Is " << LeMenu(course1, course2) << " ok?\n";

Note that you are what you are returning is probably not what you want:

return meal, dessert; //Only returns dessert

You probably want:

return meal + dessert;

answered Aug 3, 2015 at 15:41

yizzlez

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Community · Accepted Answer · 2017-05-23 10:27:06Z

2

cout << "Is " << LeMenu << " ok?\n";

Is printing the address of the function LeMenu() and not the returned string. To print the returned string you would need to call the function like:

cout << "Is " << LeMenu(course1,course2) << " ok?\n";

Also

string LeMenu(string meal, string dessert) //a F() concatenates 2 strings
{
    return meal, dessert;  //also tried meal+dessert
}

Is not going to return a concatenated string. It is using the comma operator and is only going to return the string dessert. You need to include the <string> header and then you can use the + operator like

return meal + dessert;

edited May 23, 2017 at 10:27

CommunityBot

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answered Aug 3, 2015 at 15:41

NathanOliver

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Comments

Jarod42 · Accepted Answer · 2015-08-03 15:41:42Z

2

In

cout << "Is " << LeMenu << " ok?\n";

you print the address of the function.

you want

cout << "Is " << LeMenu(course1, course2) << " ok?\n";

answered Aug 3, 2015 at 15:41

Jarod42

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