example1.c
---------------------------------------------------

/* a program to print hello world */
#include <iostream>
using namespace std;
int main()
{
    cout<<"Hello World" << endl;
    return 0;
}

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

example2.c
---------------------------------------------------

#include <iostream>
using namespace std;
int main()
{
    int x, y;       

    cout << "Enter x = ";
    cin >> x;

    cout << "Enter y = ";
    cin >> y;

    cout << "x/y=" << x/y << endl;
    cout << "x%y=" << x%y << endl;

    return 0;
}

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

example3.c
---------------------------------------------------

#include <iostream>
using namespace std;
int main()
{
    int x;   

    cout << "Enter x = ";
    cin >> x;

    if(x==0){
        cout << "Zero" << endl;
    }
    else if(x%2==0){
        cout << "Even" << endl;
    }
    else
        cout << "Odd" << endl;


    return 0;
}

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

example4.c
---------------------------------------------------

#include <iostream>
using namespace std;
int main()
{
        char x;        
        cout << "Enter a character: ";
        cin >> x;
        switch(x){
                case 'A':
                case 'a':
                        cout << "Excellent" << endl;
                        break;
                case 'B':
                case 'b':
                        cout << "Good" << endl;
                        break;
                case 'C':
                case 'c':
                        cout << "Average" << endl;
                        break;
                default:
                        cout << "Enter a,b or c only" << endl;
        }



    return 0;
}

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

example5.c
---------------------------------------------------

#include <iostream>
using namespace std;
int main()
{
    char x;
    cout << "Input a character: ";
    cin >> x;

    cout << "ASCII code: " << int(x);    

    return 0;
}

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

example6.c
---------------------------------------------------

#include <iostream>

using namespace std;

int main()
{
    char x;
    cout << "Enter a grade: ";
    cin >> x;
    if(x>='A'&&x<='Z')
        cout << "uppercase letter\n";
    else if(x>='a'&&x<='z')
        cout << "lowercase letter\n";
    else
        cout << "not a character\n";



    return 0;
}

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