C++ Help

[Spev]

I am trying to pass two values by reference from my main to be used throughout other functions I have created. Basically I'm trying to find a way to pass two values by reference entered in the main function and be able to plug those values into other functions to use them as part as calculations....I don't know the best way to do this, or really what to put in the void function at all. I mean, after all I'm just trying to basically use it as a place holder function(I think). Sorry if I'm not explaining it well, but can anyone help?

[Moonzy]

errr... something like this?

subfunction1(int Value1, int Value2)
{
	int subresult;
	subresult = Value1 + Value2;
	return result;
}

int main()
{
	int Value1, Value2, result;
	result = subfunction1(Value1, Value2);
}

forgive me if i made a mistake, its been ages since i last touched C++ `-`

[r3bify]

If you want to pass by reference just put & in front of it.

int main()
{
	int x, y;
	SomeFunction(&x, &y);
	return 0;
}

int SomeFunction(int& x, int& y)
{
	return 0;
}

super basic example, but that should do it.

[FedeWar]

On 28/4/2016 at 7:46 AM, r3bify said:

If you want to pass by reference just put & in front of it.

int main()
{
	int x, y;
	SomeFunction(&x, &y);
	return 0;
}

int SomeFunction(int& x, int& y)
{
	return 0;
}

super basic example, but that should do it.

Pass the arguments without &, this code will not compile, you are passing pointers instead of references.

[Lyrex]

I made up an example for you, I hope it's sufficient:

 

http://ideone.com/57LnhW

 

#include <iostream>
  
void square_ref(int& a);
int  square_val(int a);
  
int main() {
    int a = 2;
    int s = 2;
    
    std::cout << "a: " << a << ", s: " << s << std::endl;
    std::cout << "------" << std::endl;
    
    square_ref(a);
    square_val(s);
    std::cout << "a: " << a << ", s: " << s << std::endl;
    std::cout << "------" << std::endl;
    
    square_ref(a);
    s = square_val(s);
    std::cout << "a: " << a << ", s: " << s << std::endl;
    return ;
}
  
void square_ref(int& a)
{
    a = a*a;
}
  
int square_val(int a)
{
    return a*a;
}