C++/Vector/vector at
Use vector.at to change element in the vector
<source lang="cpp">
- include <iostream>
using std::cout; using std::endl;
- include <vector> // vector class-template definition
- include <algorithm> // copy algorithm
- include <iterator> // ostream_iterator iterator
- include <stdexcept> // out_of_range exception
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.at( 2 ) = 10; // set element at position 2 to 10 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: 1 2 10 4 5 6 2 3 4
*/ </source>