ISRO | CS | 2017 | May | C Programming | Pointers | Question 40

What is the output of this C++ program?

#include 
using namespace std;
void square (int *x)
{
*x = (*x)++ * (*x);
}
void square (int *x, int *y)
{
*x = (*x) * --(*y);
}
int main ( )
{
int number = 30;
square(&number, &number);
cout << number;
return 0;
}