example01.cpp
-----------------------------------------------
#include <iostream>
using namespace std;

int main(){  

        int i;
        for(i=50;i<54;i++)
                cout << i << ", ";
        cout << endl;

        return 0;
}

===============================================

example02.cpp
-----------------------------------------------
#include <iostream>
using namespace std;

int main(){

    	int i;
    	for(i=54;i>50;i--)
        	cout << i << ", ";
    	cout << endl;

        return 0;
}

================================================

example03.cpp
------------------------------------------------
#include <iostream>
using namespace std;

int main(){

    	int i,x,y, ans=1;
    	cout << "Enter x=";
    	cin >> x;
    	cout << "Enter y=";
    	cin >> y;
    	for(i=0;i<y;i++)
        	ans = ans * x;
    	cout << x << "^" << y << " = " << ans << endl;

        return 0;
}

================================================

example04.cpp
------------------------------------------------
#include <iostream>
using namespace std;

int main(){

	int i, j, n;
    	cout << "Enter n=";
    	cin >> n;
    	for(i=0;i<=n;i++){
        	for(j=0;j<=n;j++)
            		cout << j << " ";
        	cout << endl;
    	}

        return 0;               
}

================================================     

example05.cpp
------------------------------------------------
#include <iostream>
using namespace std;

int main(){

	int i, j, n;
    	cout << "Enter n=";
    	cin >> n;
    	for(i=0;i<=n;i++){
        	for(j=0;j<=i;j++)
            		cout << i << " ";
        	cout << endl;
    	}

        return 0;
}

================================================