Pass by reference?

**SkywardTaco** · 05-04-2015

I need help with an assignment guys. I'm not sure where to even start on this one.
Write a program that will use a function called “swapFunction” which swaps two values. The functionshould have 2 parameters passed by reference. The function does not return anything. You need tooverload the function to work with integer, character, and double data types. You need to submit asource code that shows the function definition as well as main() ( show how the function is called withinteger values, character values, and double values).
I don't recall learning this in class.

**laserlight** · 05-04-2015

Compile and run this program:

Code:

#include <iostream>

void setTo456(int& y)
{
    y = 456;
}

int main()
{
    int x = 123;
    std::cout << x << std::endl;
    setTo456(x);
    std::cout << x << std::endl;
}

The idea here is that the int& syntax in the parameter of the setTo456 function declares y to be a reference parameter, i.e., of type reference to int. This way, when setTo456(x) is called, y serves as an alias of x, so assigning 456 to y effectively assigns 456 to x.

**GReaper** · 05-04-2015

Pass by reference in C++ probably means this:

Code:

void swap(int& a, int& b)

A reference behaves just like a dereferenced pointer. When you pass it to a function, think of it as that you're passing the variable itself, not a copy of it.

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