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Dynamically allocated vector begins with 0 elements
#include <iostream>
#include <vector>
using namespace std;
typedef vector<int> INTVECTOR;
int main(void)
{
// Dynamically allocated vector begins with 0 elements.
INTVECTOR theVector;
theVector.push_back(42);
// Show statistics about vector.
cout << "theVector"s size is: " << theVector.size() << endl;
cout << "theVector"s maximum size is: " << theVector.max_size()<< endl;
cout << "theVector"s capacity is: " << theVector.capacity() << endl;
}Using a Vector of Booleans
#include <vector>
#include <iostream>
using namespace std;
int main( )
{
vector<bool> shots( 5 ); // true if pet has shot
// give shots to two pets
shots[1] = true;
shots[4].flip();
// delete the first element because that pet was adopted
shots.erase( shots.begin() );
// flip bits to show pets needing shots
shots.flip();
}vector declaration
#include <iostream>
using std::cout;
using std::cin;
using std::endl;
#include <iomanip>
using std::setw;
#include <vector>
using std::vector;
int main()
{
vector< int > integers1( 7 ); // 7-element vector< int >
vector< int > integers2( 10 ); // 10-element vector< int >
size_t i;
cout << integers1.size() << endl;
for ( i = 0; i < integers1.size(); i++ ){
cout << integers1[ i ];
}
cout << integers2.size() << endl;
for ( i = 0; i < integers2.size(); i++ ){
cout << integers2[ i ];
}
for ( size_t i = 0; i < integers1.size(); i++ )
integers1[ i ] = i;
for ( size_t i = 0; i < integers2.size(); i++ )
integers2[ i ] = i;
for ( i = 0; i < integers1.size(); i++ ){
cout << integers1[ i ];
}
for ( i = 0; i < integers2.size(); i++ ){
cout << integers2[ i ];
}
return 0;
}7
000000010
000000000001234560123456789
vector of 10 strings
#include <vector>
#include <string>
using namespace std;
int main(int argc, char** argv)
{
vector<string> stringVector(10, "hello");
return (0);
}vector"s copy constructor
#include <iostream>
using std::cout;
using std::cin;
using std::endl;
#include <iomanip>
using std::setw;
#include <vector>
using std::vector;
int main()
{
vector< int > integers1( 7 ); // 7-element vector< int >
vector< int > integers2( 10 ); // 10-element vector< int >
size_t i;
for ( i = 0; i < integers1.size(); i++ ){
cout << integers1[ i ];
}
for ( i = 0; i < integers2.size(); i++ ){
cout << integers2[ i ];
}
vector< int > integers3( integers1 ); // copy constructor
cout << integers3.size() << endl;
for ( i = 0; i < integers3.size(); i++ ){
cout << integers3[ i ];
}
return 0;
}000000000000000007
0000000
