# bulls and cows number guessing game [random seed]

Bjarne Stroustrup “Programming Principles and Practice Using C++”
Chapter 5 Exercise 13
Using std_lib_facilities.h by Bjarne Stroustrup.

[code language=”cpp”]
// Philipp Siedler
// Bjarne Stroustrup’s PP
// Chapter 5 Exercise 13

/*
input:
3
4630
y
2
4567
4567
6275
n
*/

#include "std_lib_facilities.h"

int main()
try
{
int seed;
string checkSeed;

int rndNum;
int rndNumCount = 4;
vector<int> rndNums;

int guess;
int bulls = 0;
int cows = 0;
vector<int> guessVec;

while (rndNums.size() < rndNumCount) {
cout << "Enter seed\n";
if (cin >> seed) {}
else {
cin.clear();
cin >> checkSeed;
error("Entered seed is not a number: ", checkSeed);
}

for (int i = 0; i < rndNumCount;) {
if (i == 0) {
rndNum = (rand() % 100) / 10;
rndNums.push_back(rndNum);
i++;
}
else {
rndNum = (rand() % 100) / 10;
if (rndNum != rndNums[i – 1]) {
rndNums.push_back(rndNum);
i++;
}
}
}

for (int i = 0; i < rndNums.size(); i++) {
cout << "rnd num: " << rndNums[i] << "\n";
}

cout << "Enter 4 different digit number each ranging from 0 to 9 (for example 4567):\n";
while (bulls != rndNumCount) {
bulls = 0;
cows = 0;
if (cin >> guess) {
if (guess / 1000 >= 1 && guess / 1000 < 10) {

guessVec.push_back(guess / 1000 % 10);
guessVec.push_back(guess / 100 % 10);
guessVec.push_back(guess / 10 % 10);
guessVec.push_back(guess / 1 % 10);

for (int i = 0; i < guessVec.size() – 1; i++) {
if (guessVec[i] == guessVec[i + 1]) {
error("Enter 4 different numbers.");
}
}

for (int i = 0; i < guessVec.size(); i++) {
for (int j = 0; j < guessVec.size(); j++) {
if (rndNums[j] == guessVec[i] && i == j) {
bulls++;
}
else if (rndNums[j] == guessVec[i]) {
cows++;
}
}
}
}
else {
error("Enter a 4 digit number.");
}
}
else {
error("Enter a number.");
}

cout << "Bulls: " << bulls << " Cows: " << cows << "\n";
guessVec.clear();

}
cout << "You win!\n";

cout << "Play again? Press y or n: \n";

rndNums.clear();
bulls = 0;
//break;
}
else {
break;
}
}

keep_window_open(".");
}

catch (runtime_error e) {
cout << e.what() << "\n";
keep_window_open(".");
}
catch (…) {
cout << "Extiting" << "\n";
keep_window_open(".");
}
[/code]
Enter seed
3
rnd num: 4
rnd num: 6
rnd num: 3
rnd num: 0
Enter 4 different digit number each ranging from 0 to 9 (for example 4567):
4630
Bulls: 4 Cows: 0
You win!
Play again? Press y or n:
y
Enter seed
2
rnd num: 6
rnd num: 2
rnd num: 7
rnd num: 5
Enter 4 different digit number each ranging from 0 to 9 (for example 4567):
4567
Bulls: 0 Cows: 3
4567
Bulls: 0 Cows: 3
6275
Bulls: 4 Cows: 0
You win!
Play again? Press y or n:
n