subroutine and Functions

[Eena]

Is there a difference between a subroutine and a function in C++?

[Wynd]

Not really. A subroutine just doesn't return anything (void return type).

void mysub(int a) // Void function (sub)
{
  cout<<a<<endl;
}

int myfunc(int a) // Function returns something
{
  return a + 5;
}

[Eena]

Can you call a subroutine?

[Wynd]

Yeah, look at this example code.

#include <iostream>
using namespace std;

// Function prototype
void mysub(int);
int myfunc(int);

int main()
{
	int a, b;

	cout<<"Enter a number:"<<endl;
	cin>>a;

	mysub(a); // Prints the value of a

	b = myfunc(a); // Value of b is now 5 more than the value of a

	return 0;
}

// Actual function code
void mysub(int a) // Void function (sub)
{
	cout<<a<<endl;
}

int myfunc(int a) // Function returns something
{
	return a + 5;
}

[Eena]

Thanks for that input Wynd.

[filburt1]

Also, just a terminology thing: there are no subs in C++. Everything is called functions (or methods for classes).

[kedaman]

In objective-C you call them messages
Anyways the procedures you call functions in a functional programming language and methods in a object oriented programming language