/*
 * File name: string-op.cpp
 * Purpose:   To be used in classroom demonstration.
 *            We will use string related functions such as length, substr and 
 *            find.
 * Author:    Xiannong Meng
 * Date:      02-08-2001
 */

#include <iostream>
#include <string>

using namespace std;

void main(void)
{
    string firstName;    // two variables of string type
    string fullName;     // need to have #include<string> to use them
	string myString = "Programming and Problem Solving";

	/* first we test the length function */
    firstName = "Alexandra";
    cout << " The number of characters in first name is : "
         << firstName.length() << endl;    // should be 9
    fullName = firstName + ' ' + "Jones";  // concatenate char(s), string(s)
    cout << " The number of characters in full name is : "
         << fullName.length() << endl;     // should be 15

	/* now we test the find function */
	/* 1. not found, prints string::npos */
    cout << " Position of char 'W' " << fullName.find('W') << endl;
	/* 2. found a char */
    cout << " Position of char 'a' " << fullName.find('a') << endl;
	/* 3. found a string */
    cout << " Position of char 'Jones' " << fullName.find("Jones") << endl;

	/* now test the substr function */
	cout << myString.substr(0,7) << endl; // "Program"
	cout << myString.substr(7,8) << endl; // "ming and"
	cout << myString.substr(10,0) << endl; // ""
	cout << myString.substr(24,40) << endl; // "Solving"
	cout << myString.substr(40,24) << endl; // run time error
}