fetching for some info in c++

[Flourence]

I was wondering on creating functions -custom ones- , can the function param be typeless like lua ones?

like

int add(a, b)
{return a+b;}

int main()
{int a =3; int b = 4; cout << add(a,b);}

 

[Migxxx]

Well, I'm not sure what you're requesting this for, and why does it need to be "typeless" (quotes, because it's never typeless).

Tell me if that's what you're requesting:

Preprocessor

#define add(a,b,c) {c = a+b;}
int main()
{
    int a = 1;
    int b = 1;
    int c;

    add(a,b,c);
    std::cout<<c;
    return 0;
}

or...
Templates

template <class _T>
_T add(_T a, _T b)
{
   return a+b;
}

int main()
{
    std::cout<<add<int>(1,1);
    return 0;
}

...at the end, they get a type. So, if you could enlighten me for what you need it to be "TYPELESS" I might be able to find a better way.

 

[Flourence]

i was just asking if my one up there would work or no

 

[Fallen]

Like Migxxx said but there's also another way:

#define add(x, y) x+y

 

[Flourence]

Then it wouldnt work , good to here that.

 

[Flourence]

Another thing how to convert a int to str ?

 

[Fallen]

[cpp]#include <sstream>

template<typename _Tp>
std::string toString(const _Tp& __p)
{
std::stringstream ss;
ss << __p;
std::string ret;
ss >> ret;
return ret;
}
[/cpp]

 

[Flourence]

Thanks.

 

[Doggynub]

[cpp]#include <sstream>
#include <iostream>


template<typename _Tp>
std::string toString(const _Tp& __p)
{
std::stringstream ss;
ss << __p;
std::string ret;
ss >> ret;
return ret;
}
[/cpp]

You could have used using namespace std

 

[Migxxx]

You could have used using namespace std

ohh plz no plz no!... I totally dislike namespaces. It makes the code hard to follow when you're not familiar with it or doesn't have a good IDE. It's "ok" to use them on huge libraries like boost in order to save you a few keystrokes, for example:
boost::asio::ip::tcp::resolver::query
...Now thats fucking huge. But still, thats no excuse to risk readability and a few more issues that comes along with namespaces, just for a syntactic sugar.

Like Migxxx said but there's also another way:

#define add(x, y) x+y

Well, thats actually the same as my first example (and I'm talking about the usage of preprocessor definitions) with the difference that it return a value... which at the end it's almost the same as mine. But yeh

 

[Flourence]

More info

Was learning some basics and came into making a little code , i dont get compile errors but after the first loop is done other ones is messed up it keep sending lines untill loop finishes (without waiting for input to continue) , tryed to remove getline() and replaced with cin and it worked well , but i need to get the whole line :

#include "iostream"
#include "cstdlib"
#include "string"

using namespace std;

struct db
{
    int num;
    string str;
};

int main ()
{

        db p[10];
        db *f = p;
        int x = 0;
        while (x<10)
        {
                cout << "What is his name?"<<endl;
                getline(cin,f[x].str);
                cout << "What is "<< f[x].str << "'s age?" <<endl;
                cin>>f[x].num;
                x++;
        }
        cout << "Name \t Age"<<endl;
        for(int y = 0; y<10 ; y++)
        {
               cout<< f[y].str << "\t" << f[y].num << endl;
        }




        system("PAUSE");
        return 0;
}