#include <iostream>
 using namespace std;
 const int NO_STEPS = 4;
 
 void s(int* a, int i);
 
 int main ( ) {
     int i, a[NO_STEPS] = {2, 4, 1, 3};
 
     for ( i = 0; i < NO_STEPS; i++ )
         s( a, i );
 
     for ( i = NO_STEPS - 1; i >= 0; i-- )
         cout << a[i] << ' ';
     cout << "Boom!\n";
 
     return 0;
 }
 
 void s(int* a, int i) {
     int* p;
     int  x, n = NO_STEPS / 2;
 
     if (i != n) {
         p = a + i; // be careful - pointer addition here
         x = *p;
         *p = a[n];
         a[n] = x;
     }
 }

#include<iostream>
using namespace std;
 
void s(int* a, int i);
 
main()
{
int i, a[4] = {2,4,1,3};
 
        for(i = 0; i < 4; i++)
       {
         s(a,i);
         printf("%d", a[i]);
}}
 
void s(int *a, int i)
{
  int *p; int x, n=2;
 
        if(i != 2)
        {
        p = a + i;
        x = *p;
        *p = a[2];
        a[2] = x;
}}

int array[] = {2, 3, 5, 7, 11};
int* p = array;  // p contains the memory address of array[0]
int x = *p;  // *p returns whatever's at the memory address stored in p.  So it returns the value that's in array[0].  So it return 2.  Thus, the value 2 gets assigned to the variable x.
int* q = p + 2;  // q contains the memory address 2 units after p.
int y = *q;  // *q is 5, so y gets assigned 5.