C++ STL vector and deque algorithm, rotate_copy(), integer 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 rotate_copy() (vector and deque) to exchange the elements in two adjacent ranges within a source range and copies the result to a destination range in C++ programming

To show: How to use the C++ algorithm (vector and deque), rotate_copy() to exchange the elements in two adjacent ranges within a source range and copies the result to a destination range in C++ programming

 

// C++ STL algorithm, rotate_copy()

#include <vector>

#include <deque>

#include <algorithm>

#include <iostream>

using namespace std;

 

int main(void)

{

// vector and deque containers

vector <int> vec1, vec2(9);

deque <int> deq1, deq2(6);

// vector and deque iterators

vector <int>::iterator vec1Iter, vec2Iter;

deque<int>::iterator deq1Iter, deq2Iter;

int i, j, k=1;

 

// push data in range

for(i = -3; i <= 5; i++)

vec1.push_back(i);

 

// print the data

cout<<"vec1 vector data is: ";

for(vec1Iter = vec1.begin(); vec1Iter != vec1.end(); vec1Iter++)

cout<<*vec1Iter<<" ";

cout<<endl;

rotate_copy(vec1.begin(), vec1.begin() + 3, vec1.end(), vec2.begin());

cout<<"\nAfter rotating, the vec1 vector data remains unchanged as: ";

for(vec1Iter = vec1.begin(); vec1Iter != vec1.end(); vec1Iter++)

cout<<*vec1Iter<<" ";

cout<<endl;

 

// rotate and copy to vec2

cout<<"\nBut, after rotating, the copy of vec1 vector in vec2 is, vec2: ";

for(vec2Iter = vec2.begin(); vec2Iter != vec2.end(); vec2Iter++)

cout<<*vec2Iter<<" ";

cout<<endl;

// push data in range

for(j =0; j <= 5; j++)

deq1.push_back(j);

cout<<"\nThe original deq1 deque is: ";

for(deq1Iter = deq1.begin(); deq1Iter != deq1.end(); deq1Iter++)

cout<<*deq1Iter<<" ";

cout<<endl;

 

while(k <= deq1.end() - deq1.begin())

{

// just informational

cout<<"k = "<<k<<" deq1.end() - deq1.begin(): "<<(deq1.end() - deq1.begin())<<endl;

// rotate and copy to deq2

rotate_copy(deq1.begin(), deq1.begin() + k, deq1.end(), deq2.begin());

cout<<"\nRotation of a single deque element to the back, a deque copy, deq2 is: ";

for(deq2Iter = deq2.begin(); deq2Iter != deq2.end(); deq2Iter++)

cout<<*deq2Iter<<" ";

cout<<endl;

k++;

}

return 0;

}

 

Output examples:

 

vec1 vector data is: -3 -2 -1 0 1 2 3 4 5

After rotating, the vec1 vector data remains unchanged as: -3 -2 -1 0 1 2 3 4 5

But, after rotating, the copy of vec1 vector in vec2 is, vec2:0 1 2 3 4 5 -3 -2 -1

The original deq1 deque is: 0 1 2 3 4 5

k = 1 deq1.end() - deq1.begin(): 6

Rotation of a single deque element to the back, a deque copy, deq2 is: 1 2 3 4 5 0

k = 2 deq1.end() - deq1.begin(): 6

Rotation of a single deque element to the back, a deque copy, deq2 is: 2 3 4 5 0 1

k = 3 deq1.end() - deq1.begin(): 6

Rotation of a single deque element to the back, a deque copy, deq2 is: 3 4 5 0 1 2

k = 4 deq1.end() - deq1.begin(): 6

Rotation of a single deque element to the back, a deque copy, deq2 is: 4 5 0 1 2 3

k = 5 deq1.end() - deq1.begin(): 6

Rotation of a single deque element to the back, a deque copy, deq2 is: 5 0 1 2 3 4

k = 6 deq1.end() - deq1.begin(): 6

Rotation of a single deque element to the back, a deque copy, deq2 is: 0 1 2 3 4 5

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