C++ STL vector, at() code example

Compiler: Visual C++ Express Edition 2005

Compiled on Platform: Windows XP Pro SP2

Header file: Standard

Additional library: none/default

Additional project setting: Set project to be compiled as C++

Project -> your_project_name Properties -> Configuration Properties -> C/C++ -> Advanced -> Compiled As: Compiled as C++ Code (/TP)

Other info: none

To do: Using the C++ at() to return a reference to the element at a specified location in the vector in C++ programming

To show: How to use the C++ at() to return a reference to the element at a specified location in the vector in C++ programming

// C++ STL vector, at()

#include <vector>

#include <iostream>

using namespace std;

int main(void)

{

// vector container

vector <int> vec1;

unsigned int i;

// push data into vector container

vec1.push_back(1);

vec1.push_back(7);

vec1.push_back(4);

vec1.push_back(3);

// print all elements separated by a space

cout<<"The vec1 vector data: ";

for(i=0; i<vec1.size(); ++i)

cout<<vec1[i]<<' ';

cout<<"\n\nOperation: vec1.at(position);"<<endl;

const int &x = vec1.at(1);

int &y = vec1.at(3);

int &z = vec1.at(0);

cout<<"\nThe 2nd element is "<<x<<endl;

cout<<"The 4th element is "<<y<<endl;

cout<<"The 1st element is "<<z<<endl;

return 0;

}

Output examples:

The vec1 vector data: 1 7 4 3

Operation: vec1.at(position);

The 2nd element is 7

The 4th element is 3

The 1st element is 1

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