Simplify code for an in-class demo - c++

Question

For a technical writing class I will be leading and having the rest of the class (on the school computers with Visual Studio 2013) participate in making a a simple guess game program. I am trying to make it as straight forward as possible and easy to understand as many of my classmates are not programmers.
Is there anything I can make simpler or easier to follow?
using namespace std;
int main(){
char response = 'y';
while (response != 'n'){
srand(time(NULL));
int guess = -1;
int answer = (rand() % 100) + 1;
while (guess != 0){
cout << "Guess a number between 1 and 100. Guess 0 to quit game." << endl;
cin >> guess;
if (guess == 0){
break;
}
else if (guess == answer){
cout << "Correct!" << endl;
break;
}
else if (guess < answer){
cout << "Too low, guess again!" << endl;
}
else {
cout << "Too high, guess again!" << endl;
}
}
cout << "Play again? (y/n): ";
cin >> response;
}
}

Answer 1

Consider dropping the "play again" or drop the "Guess 0 to quit". In fact, drop the "quit" because the Ctrl-C or close-button of the terminal are already there.
Rename answer to something less confusing (pick or secret) and make it const.
Extract a function for the "voodoo" to generate a random number. Makes it more legible!
Turn the while into a do {} while so you don't have this unintuitive check response != 'n' before anything ever happened at all!
Same for while(guess!=0). Except, you can lose the redundant condition altogether. You already had break there...
Lose the else if where break already made the branch redundant.
Make a polite comment about missing error handling... So people don't sue you when their programs runs haywire :)
Also, write it incrementally, so do e.g.
#include <iostream>
using namespace std;
void play_round();
int main() {
srand(time(NULL));
char response;
do {
play_round();
cout << "Play again? (y/n): ";
cin >> response;
} while (response != 'n');
}
int pick_random(int from, int to) {
return (rand() % (to-from+1)) + from;
}
void play_round() {
const int secret = pick_random(1, 100);
do {
cout << "Guess a number between 1 and 100: ";
int guess;
cin >> guess;
if (guess == secret) {
cout << "Correct!" << endl;
break;
}
} while (true);
}
And then elaborate adding
if (guess == 0) {
break;
}
And eventually
if (guess < secret) {
cout << "Too low, guess again!" << endl;
}
if (guess > secret) {
cout << "Too high, guess again!" << endl;
}
Note how the branches are independent!
Optionally elaborate, doing:
int pick_random(int from, int to) {
return (rand() % (to-from+1)) + from;
}
and use pick_random(1, 100) etc :)