Using 'std::replace' to replace value 5 by 8 : replace « STL Algorithms Modifying sequence operations « C++ Tutorial

1. C++ Tutorial
2. STL Algorithms Modifying sequence operations
3. replace

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
// The unary predicate used by replace_if to replace even numbers
bool IsEven (const int & nNum){
    return ((nNum % 2) == 0);
}

int main ()
{
    // Initialize a sample vector with 6 elements
    vector <int> v (6);

    // fill first 3 elements with value 8
    fill (v.begin (), v.begin () + 3, 8);

    // fill last 3 elements with value 5
    fill_n (v.begin () + 3, 3, 5);

    for (size_t nIndex = 0; nIndex < v.size (); ++ nIndex){
        cout << "Element [" << nIndex << "] = ";
        cout << v [nIndex] << endl;
    }

    cout << endl << "Using 'std::replace' to replace value 5 by 8" << endl;
    replace (v.begin (), v.end (), 5, 8);

    for (size_t nIndex = 0; nIndex < v.size (); ++ nIndex){
        cout << "Element [" << nIndex << "] = ";
        cout << v [nIndex] << endl;
    }

    return 0;
}