C++ students exam arrange

/////Owise Kyaw Min Oo/////
///////////////////////////

#include<iostream>
#include<conio.h>
#include<iomanip>  //for setw

using namespace std;

// structure declare

struct list
{
	int rollno;
	int MSD[3],DTCS[3],HSS[3]; // vi BE  Mechatronics majors
	int totalmark;
	int result;

}

student[3];

int main()
{
	int i,j;
	struct list part;//  define structure variable
	for(i=0;i<3;i++)
	{   cout<<"Enter roll no ";
	    cin>>student[i].rollno;//  . is accessing structure member 

	    cout<<setw(28)<<"Enter MSD\t";
		cin>>student[i].MSD[i];

		cout<<setw(28)<<"Enter DTCS\t";
		cin>>student[i].DTCS[i];

		cout<<setw(28)<<"Enter HSS\t";
		cin>>student[i].HSS[i];

		student[i].totalmark=student[i].MSD[i]+student[i].DTCS[i]+student[i].HSS[i];
		cout<<setw(28)<<" total mark for roll number "<<student[i].rollno<<" "<<setw(4)<<student[i].totalmark<<" <-----"<<"\n-------------------"<<endl;

		if((student[i].MSD[i]>=50)&&(student[i].DTCS[i]>=50)&&(student[i].HSS[i]>=50))
		{
			student[i].result = 1;
		}
		else
		{
			student[i].result = 0;
		}
	}
    cout<<"press any key to show pass or fail result \n"<<endl;
	getch();

	for(i=0;i<3;i++)
	{
		if(student[i].result == 1)
		{
			cout<<"roll no  "<<student[i].rollno<<" is pass all subjects  * "<<endl;
		}
		else
		{
		    cout<<"roll no  "<<student[i].rollno<<" is fail "<<endl;
		}

	}
	cout<<"-------\n"<<"According total mark descendng roll no :\n"<<endl;
	getch();

	for(i=0;i<3;i++)
	{
		for(j=i+1;j<3;j++)
		{
			if(student[i].totalmark<student[j].totalmark)
			{
				////first value less than second value in array change first and second etc.....

				part=student[i];

				student[i]=student[j];

				student[j]=part;
			}

		}
	}
	for(i=0;i<3;i++)
	{
		cout<<"roll no  "<<student[i].rollno<<"  "<<student[i].totalmark<<endl<<endl;
	}
	getch();
	return 0;
}