в 14:21, 25 мая 2010

2010-05-25T14:21:06Z

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2010-05-25T10:27:45Z

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==Fill in vector with array by using pointer and offset==

<source lang="cpp">
#include <algorithm>
#include <iostream>
#include <vector>
using namespace std;
int main(int argc, char** argv)
{
int elems[] = {5, 6, 9, 8, 8, 3};
vector<int> myVector(elems, elems + 6);
return (0);
}

</source>

==make the index of the maximum==

<source lang="cpp">
#include <algorithm>
#include <iostream>
#include <vector>
using namespace std;
int main( )
{
vector<int> v( 10, 66 );
v[1] = 100;
vector<int>::iterator before_itr = max_element( v.begin(), v.end() );
cout << "The maximum before resizing is " << *before_itr;
vector<int>::difference_type max_index = before_itr - v.begin();
}

</source>

==Use indexer to update element in the vector==

<source lang="cpp">

#include <iostream>
using std::cout;
using std::endl;
#include <vector>
#include <algorithm>
#include <iterator>
#include <stdexcept>
int main()
{
int array[ 6 ] = { 1, 2, 3, 4, 5, 6 };
std::vector< int > integers( array, array + 6 );
std::ostream_iterator< int > output( cout, " " );
integers.push_back( 2 );
integers.push_back( 3 );
integers.push_back( 4 );
cout << "Vector integers contains: ";
std::copy( integers.begin(), integers.end(), output );
integers[ 0 ] = 7; // set first element to 7
cout << "\n\nVector integers contains: ";
std::copy( integers.begin(), integers.end(), output );
return 0;
}
/*
Vector integers contains: 1 2 3 4 5 6 2 3 4
Vector integers contains: 7 2 3 4 5 6 2 3 4
*/

</source>

==Use toupper function to convert all elements in a char vector to upper case==

<source lang="cpp">

#include <iostream>
#include <vector>
#include <cctype>
using namespace std;
int main()
{
vector<char> v(10); // create a vector of length 10
cout << "Size = " << v.size() << endl;
for(int i=0; i<10; i++)
v[i] = i + "a";
cout << "Current Contents:\n";
for(int i=0; i<v.size(); i++) cout << v[i] << " ";
cout << "\n\n";

for(int i=0; i<v.size(); i++)
v[i] = toupper(v[i]);
cout << "Modified Contents:\n";
for(int i=0; i<v.size(); i++)
cout << v[i] << " ";
cout << endl;
return 0;
}
/*
Size = 10
Current Contents:
a b c d e f g h i j
Modified Contents:
A B C D E F G H I J
*/

</source>

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C++/Vector/vector indexer - История изменений

в 14:21, 25 мая 2010

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