C++

Forum

 
Need help with a dice probability.

BayBayMan (12)
Here is what I have so far:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
 
#include <iostream>
#include <ctime>
#include <cstdlib>

using namespace std;

int main()
{
    double toss;
    double rem;
    double prob1 ;
    double prob2;
    double prob3;
    double prob4;
    double prob5;
    double prob6;

    int count1 = 0;
    int count2 = 0;
    int count3 = 0;
    int count4 = 0;
    int count5 = 0;
    int count6 = 0;

    srand(time(NULL));

    cout << "Choose an amount of tosses you would like to try: ";

    while(cin >> toss){
        for(int i = 0; i < toss; i++){
            rem = rand()%6+1;
            if(rem == 1){
                count1++;
            }
            else if(rem == 2){
                count2++;
            }
            else if(rem == 3){
                count3++;
            }
            else if(rem == 4){
                count4++;
            }
            else if(rem == 5){
                count5++;
            }
            else if(rem == 6){
                count6++;
            }
            else{
                cout << "\nSomething went wrong, sorry.\n";
            }
        }
        
        //These probability variables are getting the percentage for each--
        //side of the die. I'm thinking my problem lies around here.
        prob1 = count1/toss;
        cout << "\nProbability for 1: " << prob1 << "%";

        prob2 = count2/toss;
        cout << "\nProbability for 2: " << prob2 << "%";

        prob3 = count3/toss;
        cout << "\nProbability for 3: " << prob3 << "%";

        prob4 = count4/toss;
        cout << "\nProbability for 4: " << prob4 << "%";

        prob5 = count5/toss;
        cout << "\nProbability for 5: " << prob5 << "%";

        prob6 = count6/toss;
        cout << "\nProbability for 6: " << prob6 << "%";
    }
}


I want to input a number of tosses, then calculate how many times each side of the die was chosen. Im using a random number generator, but im not too sure I have everything correct. I feel like im using way too many variables. We haven't learned how to use arrays in my class, so we're stuck with for loops at the moment.

I would really appreciate some help in understanding this. Thanks in advance!
BayBayMan (12)
I figured out my problem. I wasn't multiplying the probabilities by 100 to get the percentages I desired. Here is the fixed code.

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
 
#include <iostream>
#include <ctime>
#include <cstdlib>
#include <iomanip>

using namespace std;

int main()
{
    double toss;
    double rem;
    double prob1 ;
    double prob2;
    double prob3;
    double prob4;
    double prob5;
    double prob6;

    int count1 = 0;
    int count2 = 0;
    int count3 = 0;
    int count4 = 0;
    int count5 = 0;
    int count6 = 0;

    srand(time(NULL));

    cout << "Choose an amount of tosses you would like to try: ";

    while(cin >> toss){
        for(int i = 0; i < toss; i++){
            rem = rand()%6+1;
            if(rem == 1){
                count1++;
            }
            else if(rem == 2){
                count2++;
            }
            else if(rem == 3){
                count3++;
            }
            else if(rem == 4){
                count4++;
            }
            else if(rem == 5){
                count5++;
            }
            else if(rem == 6){
                count6++;
            }
            else{
                cout << "\nSomething went wrong, sorry.\n";
            }
        }
        prob1 = (count1/toss)*100;
        cout << fixed << setprecision(2) << "\nProbability for 1: " << prob1 << "%";

        prob2 = (count2/toss)*100;
        cout << "\nProbability for 2: " << prob2 << "%";

        prob3 = (count3/toss)*100;
        cout << "\nProbability for 3: " << prob3 << "%";

        prob4 = (count4/toss)*100;
        cout << "\nProbability for 4: " << prob4 << "%";

        prob5 = (count5/toss)*100;
        cout << "\nProbability for 5: " << prob5 << "%";

        prob6 = (count6/toss)*100;
        cout << "\nProbability for 6: " << prob6 << "%";
    }
}
Last edited on
Topic archived. No new replies allowed.