C++ STL  iterator, operator>= program example

 

Compiler: Visual C++ Express Edition 2005

Compiled on Platform: Windows XP Pro SP2

Header file: Standard

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++ iterator, operator>= to test if the iterator object on the left side of the operator is greater than or equal to the iterator object on the right side in C++ programming

To show: How to use the C++ iterator, operator>= to test if the iterator object on the left side of the operator is greater than or equal to the iterator object on the right side in C++ programming

 

// C++ STL iterator, operator>=

#include <iterator>

#include <vector>

#include <iostream>

using namespace std;

 

int main(void)

{

int i;

// vector container

vector<int> vec;

// vector iterator

vector <int>::iterator veciter;

 

// insert/push data into container

for(i = 10; i<= 15; ++i)

vec.push_back(i);

 

// print the data

cout<<"The vec vector data: ";

for(veciter = vec.begin(); veciter != vec.end(); veciter++)

cout<<*veciter<<" ";

cout<<endl;

 

vector <int>::reverse_iterator rvecpos1 = vec.rbegin(), rvecpos2 = vec.rbegin();

cout<<"The iterators rvecpos1 & rvecpos2 point to the second element in the reversed sequence: "<<*rvecpos1<<endl;

 

cout<<"\nOperation: rvecpos2 >= rvecpos1"<<endl;

if(rvecpos2 >= rvecpos1)

cout<<"The iterator rvecpos2 is greater than or equal to the iterator rvecpos1."<<endl;

else

cout<<"The iterator rvecpos2 is not greater than the iterator rvecpos1."<<endl;

 

cout<<"\nOperation: rvecpos2++"<<endl;

rvecpos2++;

cout<<"The iterator rvecpos2 now points to the second element in the reversed sequence: "<<*rvecpos2<<endl;

cout<<"\nOperation: rvecpos2 >= rvecpos1"<<endl;

if(rvecpos2 >= rvecpos1)

cout<<"The iterator rvecpos2 is greater than or equal to the iterator rvecpos1."<<endl;

else

cout<<"The iterator rvecpos2 is not greater than the iterator rvecpos1."<<endl;

 

cout<<"\nOperation: rvecpos1 >= rvecpos2"<<endl;

if(rvecpos1 >= rvecpos2)

cout<<"The iterator rvecpos1 is greater than or equal to the iterator rvecpos2."<<endl;

else

cout<<"The iterator rvecpos1 is not greater than the iterator rvecpos2."<<endl;

return 0;

}

 

Output examples:

 

The vec vector data: 10 11 12 13 14 15

The iterators rvecpos1 & rvecpos2 point to the second element in the reversed sequence: 15

Operation: rvecpos2 >= rvecpos1

The iterator rvecpos2 is greater than or equal to the iterator rvecpos1.

Operation: rvecpos2++

The iterator rvecpos2 now points to the second element in the reversed sequence: 14

Operation: rvecpos2 >= rvecpos1

The iterator rvecpos2 is greater than or equal to the iterator rvecpos1.

Operation: rvecpos1 >= rvecpos2

The iterator rvecpos1 is not greater than the iterator rvecpos2.

Press any key to continue . . .

 

 

C and C++ Programming Resources | C & C++ Code Example Index