Loops.cpp

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//      Loops.cpp
//                      3 versions of a   (for/while/do-while)
//
//  g++ -std=c++11 Loops.cpp -o loop_demo
 
#include <iostream>
using namespace std;
 
int main()
{
    int n{5};                        //  -std=c++11
 
// ---------------------------------------      Classical loop
//                                          rejecting loop
    {
        cout << endl <<  "Classical loop by  for" << endl;
 
        //  (initialization; continuation?; manipulation)
        for (int i = 0; i < n; ++i) {
            cout << "  " << i;
        }
        cout << endl;
    }
// ---------------------------------------      While
//                                          rejecting loop
    {
        cout << endl << "Loop by  while" << endl;
 
        int i = 0;                   // initialization
        while ( i < n ) {            // continuation?
            cout << "  " << i;
            ++i;                     // manipulation
        }
        cout << endl;
    }
// ---------------------------------------      Do While
//                                          non-rejecting loop
    {
        cout << endl << "Loop by  do while" << endl;
        cout << "           wrong for n <= 0 !!" << endl;
 
        int i(0);                    // initialization
        do {
            cout << "  " << i;
            ++i;                     // manipulation
        }
        while ( i < n );             // continuation?
 
        cout << endl;
    }
    return 0;
}