Common vector operations

Initialization and assignment

 //  Constructing Vectors  
 # Include <iostream>
# Include <vector>
 Using   Namespace STD;

 Int Main ()
{
Unsigned Int I;

 //  Constructors used in the same order as described above: 
 Vector < Int > First; //  Empty vector of ints  
 Vector < Int > Second ( 4 , 100 ); //  Forur ints with value 100  
 Vector < Int > Third (second. Begin (), second. End ());//  Iterating through second  
 Vector < Int > Fourth (third ); //  A copy of third

  //  The iterator constructor can also be used to construct from Arrays:  
    Int Myints [] = { 16 , 2 , 77 ,29 };
Vector < Int > TH (myints, myints + Sizeof (Myints )/ Sizeof ( Int ));

Cout < "  The contents of parameter th are:  " ;
 For (I = 0 ; I <th. Size (); I ++)
Cout < "  " <Th [I];

Cout <Endl;

 Return   0 ;
}

 

Traversal

 //  Vector: operator []  
 # Include <iostream>
# Include <vector>
 Using   Namespace STD;

 Int Main ()
{
Vector < Int > Myvector ( 10 ); //  10 zero-initialized Elements  
 Unsigned Int I;

Vector < Int >:: Size_type SZ = myvector. Size ();

 //  Assign some values:  
    For (I = 0 ; I <SZ; I ++) myvector [I] = I;

 //  Reverse vector using operator []:  
    For (I = 0 ; I <sz/ 2 ; I ++)
{
 Int Temp;
Temp = myvector [SZ- 1 -I];
Myvector [SZ- 1 -I] = myvector [I];
Myvector [I] = temp;
}

Cout < "  Myvector contains:  " ;
 For (I = 0 ; I <SZ; I ++)
Cout < "   " <Myvector [I];

Cout <Endl;

 Return   0 ;
}

 

Append

 //  Vector: push_back  
 # Include <iostream>
# Include <vector>
 Using   Namespace STD;

 Int Main ()
{
Vector < Int > Myvector;
 Int Myint;

Cout <"  Please enter some integers (enter 0 to end): \ n  " ;

 Do {
Cin> Myint;
Myvector. push_back (Myint );
} While (Myint );

Cout < "  Myvector stores  " <( Int ) Myvector. Size () < " Numbers. \ n  " ;

 Return   0 ;
}

 

Insert

 //  Inserting Into a vector  
 # Include <iostream>
# Include <vector>
 Using   Namespace STD;

 Int Main ()
{
Vector < Int > Myvector ( 3 , 100 );
Vector < Int >:: Iterator it;

It = myvector. Begin ();
It = myvector. insert (it, 200 );

Myvector. insert (it, 2 , 300 );

 // "It" no longer valid, get a new one:  
 It = myvector. Begin ();

Vector < Int > Anothervector ( 2 , 400 );
Myvector. insert (it + 2 , Anothervector. Begin (), anothervector. End ());

 Int Myarray [] = { 501 , 502 , 503 };
Myvector. insert (myvector. Begin (), myarray, myarray + 3 );

Cout < "  Myvector contains:  " ;
 For (It = myvector. Begin (); It <myvector. End (); It ++)
Cout < "   " <* It;
Cout <Endl;

 Return   0 ;
}

 

Delete

 //  Erasing from Vector  
 # Include <iostream>
# Include <vector>
 Using   Namespace STD;

 Int Main ()
{
Unsigned Int I;
Vector <unsigned Int > Myvector;

//  Set some values (from 1 to 10)  
    For (I = 1 ; I <= 10 ; I ++) myvector. push_back (I );

 //  Erase the 6th Element  
 Myvector. Erase (myvector. Begin () + 5 );

 //  Erase the first 3 elements:  
 Myvector. Erase (myvector. Begin (), myvector. Begin () + 3 );

Cout < "  Myvector contains:  " ;
 For (I = 0 ; I <myvector. Size (); I ++)
Cout < "   " <Myvector [I];
Cout <Endl;

 Return   0 ;
}

 

Clear

 //  Clearing Vectors  
 # Include <iostream>
# Include <vector>
 Using   Namespace STD;

 Int Main ()
{
Unsigned Int I;
Vector < Int > Myvector;
Myvector. push_back ( 100 );
Myvector. push_back ( 200 );
Myvector. push_back ( 300 );

Cout < "  Myvector contains:  " ;
 For (I = 0 ; I <myvector. Size (); I ++) cout < "   " <Myvector [I];

Myvector. Clear ();
Myvector. push_back ( 1101 );
Myvector. push_back ( 2202 );

Cout < "  \ Nmyvector contains:  " ;
 For (I = 0 ; I <myvector. Size (); I ++) cout < "   " <Myvector [I];

Cout <Endl;

Return   0 ;
}

 

More operations

Reference http://www.cplusplus.com/reference/stl/vector/