C++ miscellaneous
practice.

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
void show(const vector<int>& vi)
{
    for (size_t i = 0; i < vi.size(); ++i)
        cout << vi[i];
    cout << endl;
}
int main()
{
    vector<int> vi;
    vi.push_back(3);
    vi.push_back(5);
    vi.push_back(5);
    sort(vi.begin(), vi.end());
    show(vi);
    while(next_permutation(vi.begin(), vi.end()))
        show(vi);
    return 0;
}

==================
template<class T, class U>
U func(T a, U b)
{
	cout<<a<<"\t"<<b;
}
==================

#include <iostream>  
#include <algorithm> 
#include <vector> 
 
using namespace std;
 
int main () 
{
  vector<int> v = {4,2,10,5,1,8};
  sort(v.begin(), v.end());
  if (binary_search(v.begin(), v.end(), 4))
    cout << "found.\n"; 
  else 
  	cout << "not found.\n";
  return 0;
}

#include <iostream>
#include <string>
using namespace std;
int main() 
{
    string s = "a long string";
    s.insert(s.size() / 2, " * ");
    cout << s << endl;
    return 0;
}

#include <iostream> 
#include <vector> 
 
using namespace std; 
 
int main() 
{ 
    vector<int> v; 
    for (int i = 1; i <= 5; i++) 
        v.push_back(i);
    for(int i=0;i<v.size();i++)
    	cout<<v[i]<<" ";
    cout<<endl;
    v.assign(3, 8);
    for(int i=0;i<v.size();i++)
    	cout<<v[i]<<" ";
    cout<<endl;
    return 0; 
}

#include <iostream>
#include <vector>
using namespace std;
int main ()
{
    vector<int> myvector;
    myvector.push_back(78);
    myvector.push_back(16);
   myvector.front() += myvector.back();
    cout << myvector.front() << '\n';
    return 0;
}

#include <iostream>  
#include <algorithm> 
#include <vector> 
 
using namespace std;
 
bool IsOdd (int i) 
{ 	
	return (i%2)==1; 
}
 
int main () 
{
  vector<int> v = {4,2,10,5,1,8};
  for(int i=0;i<v.size();i++)
  	cout<<v[i]<<" ";
  cout<<endl;
  sort(v.begin(), v.end());
  for(int i=0;i<v.size();i++)
  	cout<<v[i]<<" ";
  return 0;
}

#include <iostream>
using namespace std;
template<typename T> 
inline T square(T x)
{
    T result;
    result = x * x;
    return result;
};
int main()
{
    int i, ii;
    float x, xx;
    double y, yy;
    i = 2;
    x = 2.2;
    y = 2.2;
    ii = square(i);
    cout << i << " "  << ii << endl;
    yy = square(y);
   cout << y << " " << yy << endl;
}

#include <iostream>
using namespace std;
class Base
{
    protected:
    int a;
    public:
    Base() 
    { 
        a = 34; 
    }
    Base(int i)
    { 
       a = i; 
    }
    virtual ~Base() 
    { 
        if (a < 0)  throw a; 
    }
    virtual int getA()
    {
       if (a < 0) 
        { 
            throw a;
        }
    }
};
int main()
{
    try
    {
        Base b(-25);
        cout << endl << b.getA();
    }
    catch (int) 
    {
        cout << endl << "Illegal initialization";
    }
}