C++ STL vector, back() and front() 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++ back() to return a reference to the last element of the vector and front() to return a reference to the first element in a vector in C++ programming

To show: How to use the C++ back() to return a reference to the last element of the vector and front() to return a reference to the first element in a vector in C++ programming

 

// C++ STL vector, back() and front()

#include <vector>

#include <iostream>

using namespace std;

 

int main(void)

{

// vector containers

vector <int> vec1, vec2;

unsigned int i;

 

// push data into vector container

vec1.push_back(12);

vec1.push_back(10);

vec1.push_back(7);

 

// print all elements separated by a space

cout<<"vec1 vector data: ";

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

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

cout<<endl;

int& x = vec1.back();

const int& y = vec1.front();

cout<<"\nOperation: x = vec1.back();"<<endl;

cout<<"The last integer of vec1 vector is "<<x<<endl;

cout<<"Operation: y = vec1.front();"<<endl;

cout<<"The 1st integer of vec1 vector is "<<y<<endl;

return 0;

}

 

Output examples:

 

vec1 vector data: 12 10 7

Operation: x = vec1.back();

The last integer of vec1 vector is 7

Operation: y = vec1.front();

The 1st integer of vec1 vector is 12

Press any key to continue . . .

 

 

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