A C/C++ Function Call Puzzle

Consider the following program. Predict the output of it when compiled with C and C++ compilers.

C

#include<stdio.h>

void func()
{
    /* definition */
}

int main()
{
    func();
    func(2);
}

C++

#include <iostream>
using namespace std;

void func()
{
    /* definition */
}

int main() {
    func();
    func(2);

    return 0;
}

The above program compiles fine in C, but doesn’t compile in C++.

In C++, func() is equivalent to func(void) 
In C, func() is equivalent to func(…)

Refer this for details and this for more programs that compile in C, but not in C++.

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