Computer Stuff

Seems the only difference is the method declaration:

func(int a, int b, int c)

func(int &a, int &b, int &c)

In both cases, the calling would be the same:

func(a, b, c);

Here is the code:

#include

using namespace std;

void func1(int a, int b);
void func2(int &a, int &b);
void func3(int *a, int *b);

void main(){
int a = 5;
int b = 10;
func1(a, b);
cout << "After func1: " << a << " " << b << endl;
func2(a, b);
cout << "After func2: " << a << " " << b << endl;
func3(&a, &b);
cout << "After func3: " << a << " " << b << endl;
}

void func1(int a, int b){
a = 3;
b = 6;
return;
}

void func2(int &a, int &b){
a = 3;
b = 6;
return;
}

void func3(int *a, int *b){
*a = 4;
*b = 8;
return;
}


In a sense, if you it's a pointer, you have to pass a pointer in; if it's call by value or call by reference, you just need to pass the variable in. The program knows the rest.