Question2.cpp

 /* 2.WAP to input name, roll number and marks in 5 subjects for n number of students. Write 
functions to:- 
a. Find total marks and percentage of all n students. 
b. Display details of a student with a given roll number. 
c. Display the details for all the students having percentage in a given range. 
d. Sort the array in ascending order of marks.
*/

#include <iostream>
using namespace std;
int main()
{
    int n,s;
    cout << "Enter number of students : ";
    cin >> n;

    string name[n+1];
    int roll[n+1];
    int marks[n+1][5];
    int total[n+1]={};
    float percent[n+1];
    for(int i=0;i<n;i++)
    {
        cout << "Enter Name, roll number and 5 marks of student " << i+1 << " :-" << endl;
        cin >> name[i] >> roll[i];
        for(int ii=0;ii<5;ii++)
        {
            cin >> marks[i][ii];
            total[i] = total[i]+ marks[i][ii];
        }
        percent[i]=total[i]*2;
    }
    cout << "Percentage :- " << endl;
    for(int i=0;i<n;i++)
        cout << "Student " << i+1 << " : " << percent[i] << endl;
    cout << "Enter a roll number to display details : ";
    cin >> s;
    for(int j=0;j<n;j++)
        if(s==roll[j])
        {
            cout << "\n\nDetails :- \n\nName : " << name[j] << "\nRoll Number : " << roll[j] <<  endl;
            for(int i=0;i<5;i++)
                cout << "Marks " << i+1 << " : " << marks[j][i] << endl;
            break;
        }

    int range1,range2;
    cout << "Enter the starting and ending range of percentage :- ";
    cin >> range1 >> range2;

    for(int i=0;i<n;i++)
    {
        if(percent[i]>=range1 && percent[i]<=range2)
        {
            cout << "\n\nDetails :- \n\nName : " << name[i] << "\nRoll Number : " << roll[i] <<  endl;
            for(int ii=0;ii<5;ii++)
                cout << "Marks " << ii+1 << " : " << marks[i][ii] << endl;
        }
    }
    cout << "\n\nAfter Sorting :-- " << endl;
    for(int i=0;i<n-1;i++)
    {
        for(int j=i+1;j<n;j++)
        {
            if(total[i]>total[j])
            {
                name[n] = name[i];
                name[i] = name[j];
                name[j] = name[n];

                roll[n] = roll[i];
                roll[i] = roll[j];
                roll[j] = roll[n];

                for(int ii=0;ii<5;ii++)
                {
                    marks[n][ii] = marks[i][ii];
                    marks[i][ii] = marks[j][ii];
                    marks[j][ii] = marks[n][ii];
                }

                total[n] = total[i];
                total[i] = total[j];
                total[j] = total[n];

                percent[n] = percent[i];
                percent[i] = percent[j];
                percent[j] = percent[n];

            }
        }
    }


    cout << "\n\nDetails :-\n" << endl;

    for(int i=0;i<n;i++)
    {
        cout << "\n\nName : " << name[i] << "\nRoll Number : " << roll[i] <<  endl;
        for(int ii=0;ii<5;ii++)
            cout << "Marks " << ii+1 << " : " << marks[i][ii] << endl;
    }

    return 0;
}