Movie Statistic Write a program that can be used to gather statistical data abou

Question

Movie Statistic

Write a program that can be used to gather statistical data about the number of movies college students see in a month. The program should ask the user how many students were surveyed and dynamically allocate an array of that size. The program should then allow the user to enter the number of movies each student has seen. The program should then calculate the average, median, and mode of the values entered.


Formulas Needed:

Median is the middle number in a range of ordered values. If the number of values is even, the median is the average of the middle two values.

examples:
(1,2,3,4,5) Median = 3
(1,2,3,4,5,6) Median = 3.5

Mode is a number that is repeated most often. There can be more than one mode value.

examples:
(13, 13, 13, 13, 14, 14, 15, 16, 17) Mode = 13
(13, 13, 13, 14, 14, 14, 15, 16, 17) Mode = 13 and 14

Explanation / Answer

please rate - thanks

#include <iostream>
using namespace std;
void getinfo(int*, int);
void sort(int *, int);
double average(int*, int);
double median(int*, int);
int   get_mode(int*, int);
int main()
{ int*array;  
   int num;      
   int mode,i,range;
    float avg;
    cout<<"enter number of students? ";
    cin>>num;
   while(num<=0)
    {cout<<"Invalid Entry ";
    cout<<"enter number of students? ";
    cin>>num;
    }
array=new int[num];
      getinfo(array, num);
   cout<<" The array is: ";
   for(i=0;i<num;i++)
       cout<<"student "<<i+1<<" saw "<<*(array+i)<<" movies. ";
   sort(array, num);
   cout<<"the median is "<<median(array, num) << endl;
   cout<<"the average is "<<average(array, num) << endl;
   mode=get_mode(array, num);
   if(mode<0)
         cout<<"There is no mode. ";
   else
         cout<<"The mode is " << mode << endl;
delete [] array;
system("pause");
return 0;
}
void getinfo(int *a, int n)
{int i;
   for(i=0;i<n;i++)
      {cout<<"How many movies did student "<<(i+1)<< " see? ";
       cin >> *(a+i);
        while(*(a+i)<0)          
         {cout<<"Invalid entry, must be >= 0 ";
         cout<<"How many movies did student "<<(i+1)<< " see? ";
          cin>>*(a+i);
          }
      }
}
double average(int *a, int num)
{ int tot=0,i;
   double avg;
   for(i=0;i<num; i++)
       tot+=*(a+i);
   avg=(double)tot/num;
   return avg;
}

void sort(int *a, int n)
{ int i,j,t;
for(i=0;i<n-1;i++)
     for(j=i;j<n;j++)
        if(*(a+i)>*(a+j))
           {t=*(a+i);
           *(a+i)=*(a+j);
           *(a+j)=t;
           }
}
double median(int* a, int n)
{ int m1,m2;
   if (n%2==0)
        {m1=n/2;
         m2=(n/2)-1;
         return((*(a+m1)+*(a+m2))/2.);
        }
   else
        
   return *(a+(n/2));
}
int get_mode(int* a, int n)
{
   int* count,most,index,i,j;
   count= new int[n];
   for (i= 0;i< n;i++)
         count[i] = 0;
   for(i=0;i<n;i++)
      {for(j=0;j<n;j++)
           {if(*(a+j)==*(a +i))
              (*(count+i))++;
            }
      }
   most=*count;
   index=0;
   for (i=1;i<n;i++)
      {if (*(count+i) >most)
      {most=*(count+i);
       index=i;
      }
   }
   if (most == 1)
         return -1;
   else
         return *(a+index);
}

Related Questions

Navigate

• Browse (All)
• Browse M
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.