Question 1
#include<iostream>

using namespace std;

int main(){

	string word = "Computer";
	int x;

	while (1)
	{

		// some codes

	}



        return 0;
}

Question 2
#include<iostream>

using namespace std;

int main(){

	string sentence = "Sacred Heart Canossian College";
	int x, y, i;

	while (1)
	{
		// input starting index with validation

		// input length of substring with validation (acceptable length depends on the starting index
		
		// output result by printing character by character
	}


        return 0;
}

Question 3
#include<iostream>

using namespace std;

int main(){

	string sentence;
	int count=0, i;

	// input sentence

	// count words
	// assume that each word is separated by one space
	// A fox kills a girl quickly but dies in the zoo afterwards.
	//  ^^  ^^    ^^     ^^
	
	// space followed by character = word
	// first word is an exceptional case!
	
	cout << "Number of words = " << count << endl;

    return 0;
}

Question 4(a), (b) and (c)
#include<iostream>

using namespace std;

int main(){

	string sentence;
	int i;

	// enter a sentence

	// check character by character and convert if needed

	cout << sentence << endl;

    return 0;
}

Question 5
#include <iostream>

using namespace std;

int main()
{
	string s, z;
	char x[100], y[100], temp;
	int i, len;

	cout << "Plain text: ";
	getline(cin,s);

    	len = _____		// use len to store the length of string s because you need this number frequently

	// ciphter text 1 stored in x
	for (i=0; i<len; i++)
		x[i] = ________________;
	x[len] = '\0';

	// cipher text 2 stored in y
	for (________________)
		y[i] = ______________;
	y[len] = _______;

	z = s;	// copy s to string z
	i = 0;
	while (i < len-1){
		// swap characters two by two




		i = i + 2;
	}

	cout << "Cipher text (Method 1): " << x << endl;
	cout << "Cipher text (Method 2): " << y << endl;
	cout << "Cipher text (Method 3): " << z << endl;

	return 0;
}

Question 6
#include <iostream>

using namespace std;

int main()
{
	string email;
	char no[3];
	int number;

	cout << "class: ";
	cin >> email;		// input class to string email because it is the first thing in the email address
	cout << "number: ";
	cin >> number;		// an integer

	// check if email[1] is capital letter or not, convert to lowercase letter if neccessary

	// create the string no by using the character array no[3]
	no[0] = (char) ________________;	// tens digit
	no[1] = (char) ________________;	// unit digit
	no[2] = ____________;

	email = __________________;	// concatentate email, no, and the domain of the email address
	
	cout << "email address: " << email << endl;

	return 0;
}

Quesiton 7
#include <iostream>

using namespace std;

int main()
{
	string x, y, temp;

	// input x
	// input y
	// if x is after y alphabetically, swap x and y
	
	cout << "x: " << x << endl;
	cout << "y: " << y << endl;

	return 0;
}