dev-cpp-users

[Dev-C++] arrays, how to use with rand()

[PETER C. <pca...@cc...>]

hi everyone, thanx for all of the help on the last program. im still pretty lost on what to do with it though. below i want to roll a die a number of times, user input, and output:
the face which was rolled, the occurence for each face and the percentage for that face.
i have a lot of questions:

1) how do i create an array to hold an infinite number of rolls? i.e. if the user wanted to roll the die 1 million or 1 billion times. so far i've made two arrays of 6.
2) how to output the occurences and based on that the percentage. do i use the array i created? 
3) since i am using 1+r%6 to determine range, are the faces 1-6 in elements 1-6 or do they stay in 0-5?

cpp is not my forte. im considering dropping my class. any suggestions based on the types of questions i've asked?

thanx again..
Peter/Panos


#include <iostream>
#include <ctime>
#include <cstdlib>
using namespace std;
int main()
{
    
    int rolls;
    cout << "how many times do you want to roll the die? ";     //how many times to roll die
    cin >> rolls;                                               //user input
    int faces[6] = {0};                                         //array for storage of faces of die. 
                                                                //used later to calculate percentage
    int face;                                                
    srand(time(0));                                             //user wants new random #'s generated each time 
    int face_per;
    
    int die[6] = {1,2,3,4,5,6};
        for(int i = 0; i < rolls; i++){
            face = rand();
            face = 1+ face%6;
        cout << "the die has rolled: " << face << endl;   
    }     
     return 0;   
    }    
         

 
______________ ______________ ______________ ______________
 ccny.cuny.edu


 
                   

Re: [Dev-C++] arrays, how to use with rand()

[Per W. <pw...@ia...>]

1) You don't store an infinite number of dice values - no need to. Just
emit the value for each throw on the fly. Then keep 6 counters - one for
each of the 6 faces of the dice.

2) Emit the 6 counters. Percentage is just # of occurences * 100 / total
throws.

3) If the values you put into an array are in range 1-6, of course the
values stay in that range. However, normally when counting number of
times you get a one, a two etc, you store that in an array with index 0 to
5, since all arrays in C and C++ starts with index zero.

/Per W

On Tue, 6 Jul 2004, PETER CAMPOS wrote:

> hi everyone, thanx for all of the help on the last program. im still pretty lost on what to do with it though. below i want to roll a die a number of times, user input, and output:
> the face which was rolled, the occurence for each face and the percentage for that face.
> i have a lot of questions:
>
> 1) how do i create an array to hold an infinite number of rolls? i.e. if the user wanted to roll the die 1 million or 1 billion times. so far i've made two arrays of 6.
> 2) how to output the occurences and based on that the percentage. do i use the array i created?
> 3) since i am using 1+r%6 to determine range, are the faces 1-6 in elements 1-6 or do they stay in 0-5?
>
> cpp is not my forte. im considering dropping my class. any suggestions based on the types of questions i've asked?
>
> thanx again..
> Peter/Panos
>
>
> #include <iostream>
> #include <ctime>
> #include <cstdlib>
> using namespace std;
> int main()
> {
>
>     int rolls;
>     cout << "how many times do you want to roll the die? ";     //how many times to roll die
>     cin >> rolls;                                               //user input
>     int faces[6] = {0};                                         //array for storage of faces of die.
>                                                                 //used later to calculate percentage
>     int face;
>     srand(time(0));                                             //user wants new random #'s generated each time
>     int face_per;
>
>     int die[6] = {1,2,3,4,5,6};
>         for(int i = 0; i < rolls; i++){
>             face = rand();
>             face = 1+ face%6;
>         cout << "the die has rolled: " << face << endl;
>     }
>      return 0;
>     }
>
>
>
> ______________ ______________ ______________ ______________
>  ccny.cuny.edu
>
>
>
>
>
>
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