Question

read it carefully C++

Question: Write a program that dynamically allocates an array large enough to hold a user-defined number of test scores. Once all the scores are entered, the array should be passed to a function that sorts them in ascending order. Another function should be called that calculates the average score. The program should display the sorted list of scores and averages with appropriate headings. Use pointer notation rather than array notation whenever possible. Input Validation: Do not accept negative numbers for test scores. Note: you need to submit the source code and a sample output of your code

Answer 1

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#include<iostream>
using namespace std;
int n; //global variable for number of students
float *mks; //pointer used for array of marks
void sort(float marks[]) //function to sort the arrays
{
   float temp;
   mks=marks;
   for(int i=0;i<n;i++)
   {
       for(int j=i+1;j<n;j++)
       {
           if(*(mks+i)>*(mks+j))
           {
               temp=*(mks+i);
               *(mks+i)=*(mks+j);
               *(mks+j)=temp;
           }  
       }
   }
}
float average(float marks[]) //function to calculate the average
{
   float avg=0.0;
   mks=marks;
   for(int i=0;i<n;i++)
   {
       avg+=*(mks+i);
   }
   avg=avg/n;
   return avg;
}
int main()
{
   cout<<"Enter the number of students: ";
   cin>>n;
   float *marks=new float[n]; //array of marks of students
   mks=marks;
   cout<<"\nEnter the marks of students:-\n\n";
   for(int i=0;i<n;i++)
   {
       reenter:
       cout<<"Enter marks of student"<<i+1<<": ";
       cin>>*(mks+i);
       cout<<endl;
       if(*(mks+i)<0)
       {
           cout<<"Please enter valid marks!\n\n";
           *(mks+i)=0;
           goto reenter;
       }
   }
   sort(marks);
   cout<<"\n\n Sorted Marks\n"; //for formatted output
   cout<<" -------------\n\n"; //for formatted output
   for(int i=0;i<n;i++)
   {
       cout<<"\t "<<*(mks+i)<<endl;
   }
   cout<<"\n\nAverage Marks are: "<<average(marks);
   return 0;
}

output:-

DELOPyy used Enter the number of students: 10 Enter the marks of students:- Enter marks of studenti: 12 Enter marks of student2: 15.5 Enter marks of student3: -20. Please enter valid marks! Enter marks of student3: 20 Enter marks of student4: 13 Enter marks of student5: 3 Enter marks of student6: 7 Enter marks of student7: 5 Enter marks of students: 19.5 Enter marks of studento: 17 Enter marks of student10: 8 cout<<"\n\nAverage Marks are: "<<average return

Enter marks of students: 19.5 Enter marks of student9: 17 Enter marks of student10: 8 Sorted Marks 15.5 17 19.5 20 Average Marks are: 12 Process exited after 27.38 seconds with return value o Press any key to continue. 60 61 62 cout<<"\n\nAverage Marks are: "<<average return

DELOPyy used Enter the number of students: 10 Enter the marks of students:- Enter marks of studenti: 12 Enter marks of student2: 15.5 Enter marks of student3: -20. Please enter valid marks! Enter marks of student3: 20 Enter marks of student4: 13 Enter marks of student5: 3 Enter marks of student6: 7 Enter marks of student7: 5 Enter marks of students: 19.5 Enter marks of studento: 17 Enter marks of student10: 8 cout<<"\n\nAverage Marks are: "<<average return

Enter marks of students: 19.5 Enter marks of student9: 17 Enter marks of student10: 8 Sorted Marks 15.5 17 19.5 20 Average Marks are: 12 Process exited after 27.38 seconds with return value o Press any key to continue. 60 61 62 cout<<"\n\nAverage Marks are: "<<average return