Digital and Interactive Games 2015 – Week 3, Session 1

[fardell24]

Number Guessing game

C++ Primer - up to Chapter 6

Number guessing game

Range minimum maximum

78 - player guess
How to respond:
Higher!
Lower,
Correct

97 lower
89 lower
85 higher
88 correct!
|
\/
finish
|
\/
Do you want to play again!

Pseudocode
main
define variables
while loop
...

Include string

Function
moodle: 25 February - 3 March

#include
#include

int main() {
int minValue{1};
int maxValue{100};

return 0;
}
...
Pseudocode
include string
main
min and max
user input
prompt for input
Accept input

Code
#include
#include
using std::cin;
using std::cout;

int main() {
int minValue{ 1 };
int maxValue{ 100 };
string input{ cin };
cout << “Input a number: “;
cin >> input;
}
...

std::cin >> minValue >> maxValue;

C++ Primer – Chapter 17
Section 17.4
Default Random Engine

default_random_engine e;

cout << e() << endl;

std::uniform_int_distribution intValue(1, 100);
cout << intValue(e) << endl;

complete code here:

#include
#include
using std::cin;
using std::cout;

int main() {
int minValue{ 1 };
int maxValue{ 100 };
string input{ cin };
cout << “Input a number: “;
cin >> input;
default_random_engine e;

cout << e() << endl;

std::uniform_int_distribution intValue(1, 100);
cout << intValue(e) << endl;
}


...

int theNumber = intValue(e);
cout << intValue(e) << endl;
cout << “Choose a number between “ << minValue << “ and “ << maxValue << “ : “;
int guessNumber{ 0 };


cin >> guessNumber
if (guessNumber > theNumber)
cout << “My Number is lower than: “ << guessNumber << endl;
else if (guessNumber < theNumber)
cout << “My Number is higher than “ << guessNumber << endl;
else
cout << “You've won!” << endl;

while loop or do while loop.

Do While loop

do {
.
.
} while()

A seed is required.

System time?

How to seed

Check if input numbers are correct

Ask if you want to play again.

How to sed
Use system time.
...
Conditions
1 – In between the minimum and maximum
2 – A number
What to do if either of those aren't met.


Cin >> guessNumber
if (guessNumber > minValue && guessNumber < maxValue)

...

cin guessNumber;




try {
cin << guessNumber
} catch (runtime error e) {
“Please enter a number”
}


Try Catch


using std::getline;

int main() {
string sInput:

getline(std::cin >> sInput);
int anIntValue{ 0 };

return 0;
}

string gradeResult (int gradeValue) {
string sReturnValue{ “” };
if (gradeValue > 90)
sReturnValue = “A”;
else if (gradeValue > 80)
sReturnValue = “B”;
else if (gradeValue > 70)
sReturnValue = “C”;
else if (gradeValue > 60)
sReturnValue = “D”;
else
sReturnValue = “F”;

return sReturnValue;
}



int nIntValue{ 0 };

cout << gradeResult(stoi(sInput)) << endl;

Between string and main – swap function

int swap(int a, int b) {
int netVal;

int temp;
temp = a;
a = b;
b = temp;

cout << “A: ” << a << “B: ” << b << endl;

return retVal;
}

int a{ 10 };
int b{ 20 };

swap(a, b);